Marine Plumbing & Ventilation - Thru-Hull Fittings

13 products

  • Sale -13% Attwood Stainless Steel ThruHull Standard Straight Barbed  1 Inner Diameter 665483

    Attwood Marine Attwood Stainless Steel Thru-Hull Standard Straight Barbed - 1" Inner Diameter [66548-3]

    13 in stock

    Stainless Steel Thru-Hull Standard Straight Barbed - 1" Inner DiameterPolish your image with these beautiful, durable stainless steel fittings. Why specify plastic parts when these fittings will last the life of the boat?Rugged Stainless Construction: Cast from certified Enhanced 316 Stainless Steel alloy for strength and lifetime corrosion-resistance All visible areas are polished to a mirror finish, then passivate each part for additional protection Thick steel sidewalls withstand continual stress and hose flexing Faster, Simpler Installation: Each Thru-Hull is available with a new silicone gasket A channel under the flange holds a bead of sealant, making it easier to apply a trouble-free seal All models have wrench flats or an end notch to hold as a gripping surface; one installer can tighten all connections from inside the hull The barbed tail ends provide plenty of room to hold multiple clamps Stainless Steel Straight Thru-Hulls, BarbedStandard Thread model has a full-length thread for thick hulls and easy tighteningSpecifications: Hose size: (inch) 1" inner diameter Flange Diameter: (inch) 2-1/4" Thread O.D. (outside diameter): (inch) 1-3/8"  Thread Length: (inch) 2-1/4" Barb Length: (inch) 1-1/4" Total Length: (inch) 3-7/8" Install Hole Saw Size: (inch) 1-1/2"  Thread NPSM: (inch) 1" Max Hull Thickness: (inch) 1-3/4" *Stainless Steel Thru-Hull Connectors are designed for installation above the water line only Specifications: Hose Size: 1" Material: Stainless Steel Box Dimensions: 3"H x 4"W x 7"L WT: 0.8 lbs UPC: 022697665485 Quick Guide (pdf)

    13 in stock

    $35.42 $30.99

  • Attwood White Plastic 90 Degree ThruHull Connector  34 Inner Diameter 38773

    Attwood Marine Attwood White Plastic 90 Degree Thru-Hull Connector - 3/4" Inner Diameter [3877-3]

    10 in stock

    White Plastic 90 Degree Thru-Hull Connector - 3/4" Inner Diameter90° Thru-Hulls are ideal for tight installations, such as livewell overflow drains. The angled design also eliminates hose kinking.Specifications: Fits Hose Size: (inch) 3/4"inner diameter Max Hull Thickness: (inch) 1" Flange Diameter: (inch) 1-1/2" Installation Hole Size: (inch) 1" Drain Plug: (inch) 1/2" Color: White *Plastic Thru-Hull Connectors are designed for installation above the water line only Specifications: Hose Size: 3/4" Material: Plastic Box Dimensions: 1"H x 2"W x 3"L WT: 0.2 lbs UPC: 022697387738 Quick Guide (pdf)

    10 in stock

    $9.99

  • Sale -7% Attwood Stainless Steel ThruHull Standard Straight Barbed  58 Inner Diameter 665463

    Attwood Marine Attwood Stainless Steel Thru-Hull Standard Straight Barbed - 5/8" Inner Diameter [66546-3]

    6 in stock

    Stainless Steel Thru-Hull Standard Straight Barbed - 5/8" Inner DiameterPolish your image with these beautiful, durable stainless steel fittings. Why specify plastic parts when these fittings will last the life of the boat?Rugged Stainless Construction: Cast from certified Enhanced 316 Stainless Steel alloy for strength and lifetime corrosion-resistance All visible areas are polished to a mirror finish, then passivate each part for additional protection Thick steel sidewalls withstand continual stress and hose flexing Faster, Simpler Installation: Each Thru-Hull is available with a new silicone gasket A channel under the flange holds a bead of sealant, making it easier to apply a trouble-free seal All models have wrench flats or an end notch to hold as a gripping surface; one installer can tighten all connections from inside the hull The barbed tail ends provide plenty of room to hold multiple clamps Stainless Steel Straight Thru-Hulls, BarbedStandard Thread model has a full-length thread for thick hulls and easy tighteningSpecifications: Hose size: (inch) 5/8" inner diameter Flange Diameter: (inch) 1-7/8" Thread O.D. (outside diameter): (inch) 1"  Thread Length: (inch) 2" Barb Length: (inch) 1-1/4" Total Length: (inch) 3-3/4" Install Hole Saw Size: (inch) 1-1/8"  Thread NPSM: (inch) 3/4" Max Hull Thickness: (inch) 1-1/16" *Stainless Steel Thru-Hull Connectors are designed for installation above the water line only Specifications: Hose Size: 5/8" Material: Stainless Steel Box Dimensions: 2"H x 3"W x 6"L WT: 0.5 lbs UPC: 022697665461 Quick Guide (pdf)

    6 in stock

    $27.99 $25.99

  • Sale -7%Last stock! Attwood White Plastic 90 Degree ThruHull Connector  118 Inner Diameter 38793

    Attwood Marine Attwood White Plastic 90 Degree Thru-Hull Connector - 1-1/8" Inner Diameter [3879-3]

    5 in stock

    White Plastic 90 Degree Thru-Hull Connector - 1-1/8" Inner Diameter90° Thru-Hulls are ideal for tight installations, such as livewell overflow drains. The angled design also eliminates hose kinking.Specifications: Fits Hose Size: (inch) 1-1/8"inner diameter Max Hull Thickness: (inch) 1-7/8" Flange Diameter: (inch) 2-7/16" Installation Hole Size: (inch) 1-5/16" Drain Plug: (inch) 7/8" Color: White *Plastic Thru-Hull Connectors are designed for installation above the water line only Specifications: Hose Size: 1-1/8" Material: Plastic Box Dimensions: 2"H x 4"W x 7"L WT: 0.25 lbs UPC: 022697387936 Quick Guide (pdf)

    5 in stock

    $16.19 $14.99

  • Sale -8% Attwood Stainless Steel ThruHull Standard Straight Barbed  34 Inner Diameter 665473

    Attwood Marine Attwood Stainless Steel Thru-Hull Standard Straight Barbed - 3/4" Inner Diameter [66547-3]

    8 in stock

    Stainless Steel Thru-Hull Standard Straight Barbed - 3/4" Inner DiameterPolish your image with these beautiful, durable stainless steel fittings. Why specify plastic parts when these fittings will last the life of the boat?Rugged Stainless Construction: Cast from certified Enhanced 316 Stainless Steel alloy for strength and lifetime corrosion-resistance All visible areas are polished to a mirror finish, then passivate each part for additional protection Thick steel sidewalls withstand continual stress and hose flexing Faster, Simpler Installation: Each Thru-Hull is available with a new silicone gasket A channel under the flange holds a bead of sealant, making it easier to apply a trouble-free seal All models have wrench flats or an end notch to hold as a gripping surface; one installer can tighten all connections from inside the hull The barbed tail ends provide plenty of room to hold multiple clamps Stainless Steel Straight Thru-Hulls, BarbedStandard Thread model has a full-length thread for thick hulls and easy tighteningSpecifications: Hose size: (inch) 3/4" inner diameter Flange Diameter: (inch) 1-7/8" Thread O.D. (outside diameter): (inch) 1"  Thread Length: (inch) 2" Barb Length: (inch) 1-1/4" Total Length: (inch) 3-3/4" Install Hole Saw Size: (inch) 1-1/8"  Thread NPSM: (inch) 3/4" Max Hull Thickness: (inch) 1-5/8" *Stainless Steel Thru-Hull Connectors are designed for installation above the water line only Specifications: Hose Size: 3/4" Material: Stainless Steel Box Dimensions: 2"H x 3"W x 6"L WT: 0.6 lbs UPC: 022697665478 Quick Guide (pdf)

    8 in stock

    $30.39 $27.99

  • Sale -13% Attwood Stainless Steel Scupper Valve Barbed  112 Hose Size 665533

    Attwood Marine Attwood Stainless Steel Scupper Valve Barbed - 1-1/2" Hose Size [66553-3]

    Stainless Steel Scupper Valve Barbed - 1-1/2" Hose SizePolish your image with these beautiful, durable stainless steel fittings. Why specify plastic parts when these fittings will last the life of the boat?Rugged Stainless Construction: Cast from certified Enhanced 316 Stainless Steel alloy for strength and lifetime corrosion-resistance All visible areas are polished to a mirror finish, then passivate each part for additional protection Thick steel sidewalls withstand continual stress and hose flexing Faster, Simpler Installation: Each Scupper Valve is available with a new silicone gasket A channel under the flange holds a bead of sealant, making it easier to apply a trouble-free seal All models have wrench flats or an end notch to hold as a gripping surface; one installer can tighten all connections from inside the hull The barbed tail ends provide plenty of room to hold multiple clamps Stainless Steel Scupper Valves, Barbed: The Scupper Flap is tough neoprene rubber with a molded V that fits into the grooved body to reduce backwash Fasteners are concealed and corrosion-proof Specifications: Hose size: (inch) 1-1/2" inner diameter Thread Diameter: (inch) 1-7/8"  Flange O.D. (outside diameter): (inch) 3" Thread Length: (inch) 3-1/2" Barb Length: (inch) 1-1/2" Total Length: (inch) 5-1/2" Install Hole Saw Size: (inch) 2"  Thread NPSM: (inch) 1-1/2" Max Hull Thickness: (inch) 3" *Stainless Steel Thru-Hull Connectors are designed for installation above the water line only Specifications: Hose Size: 1-1/4" Material: Stainless Steel Box Dimensions: 3"H x 3"W x 6"L WT: 3 lbs UPC: 022697665539 Quick Guide (pdf)

    $102.83 $88.99

  • Sale -13% Attwood Stainless Steel ThruHull Standard Straight Barbed  118 Inner Diameter 665493

    Attwood Marine Attwood Stainless Steel Thru-Hull Standard Straight Barbed - 1-1/8" Inner Diameter [66549-3]

    11 in stock

    Stainless Steel Thru-Hull Standard Straight Barbed - 1-1/8" Inner DiameterPolish your image with these beautiful, durable stainless steel fittings. Why specify plastic parts when these fittings will last the life of the boat?Rugged Stainless Construction: Cast from certified Enhanced 316 Stainless Steel alloy for strength and lifetime corrosion-resistance All visible areas are polished to a mirror finish, then passivate each part for additional protection Thick steel sidewalls withstand continual stress and hose flexing Faster, Simpler Installation: Each Thru-Hull is available with a new silicone gasket A channel under the flange holds a bead of sealant, making it easier to apply a trouble-free seal All models have wrench flats or an end notch to hold as a gripping surface; one installer can tighten all connections from inside the hull The barbed tail ends provide plenty of room to hold multiple clamps Stainless Steel Straight Thru-Hulls, BarbedStandard Thread model has a full-length thread for thick hulls and easy tighteningSpecifications: Hose size: (inch) 1-1/8" inner diameter Flange Diameter: (inch) 2-1/4" Thread O.D. (outside diameter): (inch) 1-3/8"  Thread Length: (inch) 2-3/8" Barb Length: (inch) 1-1/4" Total Length: (inch) 3-7/8" Install Hole Saw Size: (inch) 1-1/4"  Thread NPSM: (inch) 1" Max Hull Thickness: (inch) 1-3/4" *Stainless Steel Thru-Hull Connectors are designed for installation above the water line only Specifications: Hose Size: 1-1/8" Material: Stainless Steel Box Dimensions: 2"H x 4"W x 7"L WT: 0.85 lbs UPC: 022697665492 Quick Guide (pdf)

    11 in stock

    $42.28 $36.99

  • Sale -12% Attwood Stainless Steel ThruHull Standard Straight Barbed  112 Inner Diameter 665513

    Attwood Marine Attwood Stainless Steel Thru-Hull Standard Straight Barbed - 1-1/2" Inner Diameter [66551-3]

    7 in stock

    Stainless Steel Thru-Hull Standard Straight Barbed - 1-1/2" Inner DiameterPolish your image with these beautiful, durable stainless steel fittings. Why specify plastic parts when these fittings will last the life of the boat?Rugged Stainless Construction: Cast from certified Enhanced 316 Stainless Steel alloy for strength and lifetime corrosion-resistance All visible areas are polished to a mirror finish, then passivate each part for additional protection Thick steel sidewalls withstand continual stress and hose flexing Faster, Simpler Installation: Each Thru-Hull is available with a new silicone gasket A channel under the flange holds a bead of sealant, making it easier to apply a trouble-free seal All models have wrench flats or an end notch to hold as a gripping surface; one installer can tighten all connections from inside the hull The barbed tail ends provide plenty of room to hold multiple clamps Stainless Steel Straight Thru-Hulls, BarbedStandard Thread model has a full-length thread for thick hulls and easy tighteningSpecifications: Hose size: (inch) 1-1/2" inner diameter Flange Diameter: (inch) 3" Thread O.D. (outside diameter): (inch) 1-7/8"  Thread Length: (inch) 2-1/2" Barb Length: (inch) 1-1/4" Total Length: (inch) 4-1/8" Install Hole Saw Size: (inch) 2"  Thread NPSM: (inch) 1-1/2" Max Hull Thickness: (inch) 1-7/8" *Stainless Steel Thru-Hull Connectors are designed for installation above the water line only Specifications: Hose Size: 1-1/2" Material: Stainless Steel Box Dimensions: 3"H x 5"W x 8"L WT: 1.55 lbs UPC: 022697665515 Quick Guide (pdf)

    7 in stock

    $61.56 $53.99

  • Sale -10%Last stock! Attwood White Plastic ThruHull Fitting  118 Inner Diameter 38743

    Attwood Marine Attwood White Plastic Thru-Hull Fitting - 1-1/8" Inner Diameter [3874-3]

    2 in stock

    White Plastic Thru-Hull Fitting - 1-1/8" Inner DiameterThis thru-hull fitting is made with a durable, thermoplastic construction, which prevents electrolysis.Specifications: Hose Size: (inch) 1-1/8" Inner diameter Stem Length: (inch) 3-1/4" Max Hull Thickness: (inch) 1-1/4" Flange Diameter: (inch) 2-1/4" Installation Hole Size: (inch) 1-3/8" Drain Plug: (inch) 7/8" Construction: Polypropylene Color: White  *Plastic thru-hull connectors are designed for installation above the water line only Specifications: Hose Size: 1-1/8" Material: Plastic Box Dimensions: 3"H x 4"W x 7"L WT: 0.25 lbs UPC: 022697387431 Quick Guide (pdf)

    2 in stock

    $9.99 $8.99

  • Sale -9% Attwood Stainless Steel ThruHull Short Straight Barbed  1 Inner Diameter 665423

    Attwood Marine Attwood Stainless Steel Thru-Hull Short Straight Barbed - 1" Inner Diameter [66542-3]

    6 in stock

    Stainless Steel Thru-Hull Short Straight Barbed - 1" Inner DiameterPolish your image with these beautiful, durable stainless steel fittings. Why specify plastic parts when these fittings will last the life of the boat?Rugged Stainless Construction: Cast from certified Enhanced 316 Stainless Steel alloy for strength and lifetime corrosion-resistance All visible areas are polished to a mirror finish, then passivate each part for additional protection Thick steel sidewalls withstand continual stress and hose flexing Faster, Simpler Installation: Each Thru-Hull is available with a new silicone gasket A channel under the flange holds a bead of sealant, making it easier to apply a trouble-free seal All models have wrench flats or an end notch to hold as a gripping surface; one installer can tighten all connections from inside the hull The barbed tail ends provide plenty of room to hold multiple clamps Stainless Steel Straight Thru-Hulls, BarbedShort Thread is a more compact size, which allows installation near corners and in confined areasSpecifications: Hose size: (inch) 1" inner diameter Flange Diameter: (inch) 2-1/4" Thread O.D. (outside diameter): (inch) 1-3/8"  Thread Length: (inch) 1-1/8" Barb Length: (inch) 1" Total Length: (inch) 2-1/2" Install Hole Saw Size: (inch) 1-1/2"  Thread NPSM: (inch) 1" Max Hull Thickness: (inch) 5/8" *Stainless Steel Thru-Hull Connectors are designed for installation above the water line only Specifications: Hose Size: 1" Material: Stainless Steel Box Dimensions: 2"H x 3"W x 3"L WT: 0.6 lbs UPC: 022697665423 Quick Guide (pdf)

    6 in stock

    $35.16 $31.99

  • Sale -9% Attwood Stainless Steel ThruHull Short Straight Barbed  34 Inner Diameter 665413

    Attwood Marine Attwood Stainless Steel Thru-Hull Short Straight Barbed - 3/4" Inner Diameter [66541-3]

    7 in stock

    Stainless Steel Thru-Hull Short Straight Barbed - 3/4" Inner DiameterPolish your image with these beautiful, durable stainless steel fittings. Why specify plastic parts when these fittings will last the life of the boat?Rugged Stainless Construction: Cast from certified Enhanced 316 Stainless Steel alloy for strength and lifetime corrosion-resistance All visible areas are polished to a mirror finish, then passivate each part for additional protection Thick steel sidewalls withstand continual stress and hose flexing Faster, Simpler Installation: Each Thru-Hull is available with a new silicone gasket A channel under the flange holds a bead of sealant, making it easier to apply a trouble-free seal All models have wrench flats or an end notch to hold as a gripping surface; one installer can tighten all connections from inside the hull The barbed tail ends provide plenty of room to hold multiple clamps Stainless Steel Straight Thru-Hulls, BarbedShort Thread is a more compact size, which allows installation near corners and in confined areasSpecifications: Hose size: (inch) 3/4" inner diameter Flange Diameter: (inch) 1-7/8" Thread O.D. (outside diameter): (inch) 1"  Thread Length: (inch) 1" Barb Length: (inch) 1" Total Length: (inch) 2-1/2" Install Hole Saw Size: (inch) 1-1/8"  Thread NPSM: (inch) 3/4" Max Hull Thickness: (inch) 5/8" *Stainless Steel Thru-Hull Connectors are designed for installation above the water line only Specifications: Hose Size: 3/4" Material: Stainless Steel Box Dimensions: 2"H x 3"W x 6"L WT: 0.4 lbs UPC: 022697665416 Quick Guide (pdf)

    7 in stock

    $29.74 $26.99

  • Sale -11% Attwood Stainless Steel ThruHull Short Straight Barbed  112 Inner Diameter 665453

    Attwood Marine Attwood Stainless Steel Thru-Hull Short Straight Barbed - 1-1/2" Inner Diameter [66545-3]

    6 in stock

    Stainless Steel Thru-Hull Short Straight Barbed - 1-1/2" Inner Diameter Polish your image with these beautiful, durable stainless steel fittings. Why specify plastic parts when these fittings will last the life of the boat?Rugged Stainless Construction: Cast from certified Enhanced 316 Stainless Steel alloy for strength and lifetime corrosion-resistance All visible areas are polished to a mirror finish, then passivate each part for additional protection Thick steel sidewalls withstand continual stress and hose flexing Faster, Simpler Installation: Each Thru-Hull is available with a new silicone gasket A channel under the flange holds a bead of sealant, making it easier to apply a trouble-free seal All models have wrench flats or an end notch to hold as a gripping surface; one installer can tighten all connections from inside the hull The barbed tail ends provide plenty of room to hold multiple clamps Stainless Steel Straight Thru-Hulls, BarbedShort Thread is a more compact size, which allows installation near corners and in confined areasSpecifications: Hose size: (inch) 1-1/2" inner diameter Flange Diameter: (inch) 3" Thread O.D. (outside diameter): (inch) 1-7/8"  Thread Length: (inch) 1-1/4" Barb Length: (inch) 1-1/2" Total Length: (inch) 3-1/8" Install Hole Saw Size: (inch) 2"  Thread NPSM: (inch) 1-1/2" Max Hull Thickness: (inch) 5/8" *Stainless Steel Thru-Hull Connectors are designed for installation above the water line only Specifications: Hose Size: 1-1/2" Material: Stainless Steel Box Dimensions: 3"H x 3"W x 3"L WT: 1.2 lbs UPC: 022697665454 Quick Guide (pdf)

    6 in stock

    $61.99 $54.99

  • Sale -9% Attwood Plastic ThruHull Fitting  112  White 38753

    Attwood Marine Attwood Plastic Thru-Hull Fitting - 1-1/2" - White [3875-3]

    15 in stock

    Plastic Thru-Hull Fitting - 1-1/2" - WhiteThese thru-hulls are made with a durable, thermoplastic construction which prevents electrolysis.Caution: Thru-Hull connectors are designed for installation above the water line only.Specifications: Fits Hose Size: 1-1/2" I.D. Stem Length: 3-1/2" Max. Hull Thickness: 1-1/4" Flange Diameter: 3" Installation Hose Size: 1-7/8" to 2" Construction: Polypropylene WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov. Specifications: Hose Size: 1-1/2" Material: Plastic Box Dimensions: 4"H x 6"W x 9"L WT: 0.2 lbs UPC: 022697387530

    15 in stock

    $10.99 $9.99

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