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Marine Plumbing & Ventilation - Fittings

Ensure secure and reliable plumbing connections with premium marine plumbing and ventilation fittings designed for dependable performance in demanding boating environments. Essential for freshwater, raw water, sanitation, fuel, and ventilation systems, quality fittings help maintain proper flow while reducing the risk of leaks and system failures. Built for freshwater and saltwater applications, our collection features durable fittings crafted from corrosion-resistant brass, stainless steel, reinforced composites, and other marine-grade materials engineered to withstand moisture, vibration, pressure, and harsh marine conditions. Browse hose barbs, elbows, tees, couplings, adapters, reducers, connectors, threaded fittings, bulkhead fittings, replacement components, and installation accessories for a variety of marine systems. Designed for secure installation and long-lasting reliability, these products support efficient plumbing and ventilation performance throughout your vessel. Featuring trusted marine brands recognized for quality and innovation, our Marine Plumbing & Ventilation – Fittings collection delivers dependable solutions for repairs, maintenance, and new installations. Shop today with confidence.

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  • GROCO 3/4" NPT Bronze 3-Way Valve [TWV-750]
    GROCO

    GROCO 3/4" NPT Bronze 3-Way Valve [TWV-750]

    $72.97
    $109.47
    $72.97
    3/4" NPT Bronze 3-Way Valve Features: 3-way valve operates logically - The handle points to the direction of flow Center position is "off" Handle rotates a full 180°. Mount foot included. Full flow.   Stainless steel handle and hardware.  PTFE seats and seals.   UL...
    $72.97
    $109.47
    $72.97
  • Perko Garboard Drain Plus w/Steel Wrench [0124000PLB]
    Perko

    Perko Garboard Drain Plus w/Steel Wrench [0124000PLB]

    $155.77
    $225.79
    $155.77
    Garboard Drain Plus with Steel WrenchComplete with Zinc Plated Steel Wrench. Specifications: Cast Bronze Flange Brass Plug Complete with Zinc Plated Steel Wrench Flange Outer Diameter: 3-1/8" Pipe Size: 1" Length: 1" Threaded Screw Size: #10
    $155.77
    $225.79
    $155.77
  • Perko 0543 Vented Fill f/1-1/2" Hose - Straight Neck - Gas - Black [0543DPGBLK]
    Perko

    Perko 0543 Vented Fill f/1-1/2" Hose - Straight Neck - Gas - Black [0543DPGBLK]

    $50.51
    $77.34
    $50.51
    0543 Vented Fill f/1-1/2" Hose - Straight Neck - Gas - BlackBlack Polymer Cap with Black Polymer Body Black Polymer Strap Integral Tank Vent with Flame Arrestor and Anti Surge Valve Technical Information For Hose Size: 1-1/2" For Vent Hose: 5/8" O.D. Flange: 3-5/8"...
    $50.51
    $77.34
    $50.51
  • Perko Spare Gas Cap w/O-Ring & Cable [1270DPG99A]
    Perko

    Perko Spare Gas Cap w/O-Ring & Cable [1270DPG99A]

    $28.06
    $42.78
    $28.06
    Spare Gas Cap w/O-Ring & CableBlack polymer gas cap has a slot between the holes.
    $28.06
    $42.78
    $28.06
  • GROCO 1/2" NPT 90 Bronze Fuel Valve [FV-590]
    GROCO

    GROCO 1/2" NPT 90 Bronze Fuel Valve [FV-590]

    $33.67
    $49.12
    $33.67
    1/2" NPT 90° Bronze Fuel ValveFeatures: Compact design 90° flow path 1/2" NPT male and female ports Use FV-590 (Brass) for fiberglass tanks Use FV-590-S (316SS) with aluminum or stainless steel tanks Specifications: Construction: Bronze Box Dimensions: 2"H x 3"W x 3"L WT: 0.54...
    $33.67
    $49.12
    $33.67
  • GROCO 3/4" Bronze In-Line Check Valve [CV-75]
    GROCO

    GROCO 3/4" Bronze In-Line Check Valve [CV-75]

    $40.69
    $60.35
    $40.69
    3/4" Bronze In-Line Check ValveFeatures: C83600 cast bronze construction NPT threaded ports 1/2" - 2" sizes Suitable for use with diesel fuel or gasoline Specifications: Construction: Bronze Box Dimensions: 3"H x 3"W x 4"L WT: 0.55 lbs UPC: 742985145948
    $40.69
    $60.35
    $40.69
  • Perko Vented Flip Top Cap f/Fills with 1-1/2" Hose - White [0795DP0WHT]
    Perko

    Perko Vented Flip Top Cap f/Fills with 1-1/2" Hose - White [0795DP0WHT]

    $42.09
    $64.05
    $42.09
    Perko Vented Flip Top Cap f/Fills with 1-1/2" Hose White Polymer Easily Mounts Directly on Gunnel with Removing Fill Body Includes Metallic Inserts for Gas, Diesel or Water Fills Integral Tank Vent with Flame Arrestor No Deck Plate Key or Ground Wire Required Flip...
    $42.09
    $64.05
    $42.09
  • Perko 0541Vented Fill f/1-1/2" Hose - Straight Neck - Gas [0541DPGCHR]
    Perko

    Perko 0541Vented Fill f/1-1/2" Hose - Straight Neck - Gas [0541DPGCHR]

    $77.18
    $118.70
    $77.18
    0541 Vented Fill f/1-1/2" Hose - Straight Neck - Gas Straight Neck Chrome Plated Bronze Cap Black Polymer Body Stainless Steel Bead Chain Integral Tank Vent with Flame Arrestor and Anti Surge Valve Deck Plate Key and O-Ring Included Technical Information For Hose Size:...
    $77.18
    $118.70
    $77.18
  • Perko 0590 Vented Fill f/1-1/2" Hose - Angled Neck - Chrome [0590DPGCHR]
    Perko

    Perko 0590 Vented Fill f/1-1/2" Hose - Angled Neck - Chrome [0590DPGCHR]

    $120.68
    $184.60
    $120.68
    0590 Vented Fill f/1-1/2" Hose - Angled Neck - ChromeChrome Plated Bronze Cap Black Polymer Body Stainless Steel Bead Chain Integral Tank Vent with Flame Arrestor and Anti Surge Valve (on diesel only) Deck Plate Key Not Required *Note: Consider using the Mounting Ring (Fig....
    $120.68
    $184.60
    $120.68
  • Perko 0540 Gas Fill/Vent f/1-1/2" Hose - Angled Neck [0540DPGCHR]
    Perko

    Perko 0540 Gas Fill/Vent f/1-1/2" Hose - Angled Neck [0540DPGCHR]

    $77.18
    $118.70
    $77.18
    0540 Gas Fill/Vent for 1-1/2" Hose - Angled NeckFeatures: Angled Neck Chrome Plated Bronze Cap Black Polymer Body Stainless Steel Bead Chain Integral Tank Vent with Flame Arrestor and Anti Surge Valve Deck Plate Key Included Quick Guide (pdf)
    $77.18
    $118.70
    $77.18
  • Whitecap C.P. Brass Outlet 2-3/4" Base 1" Depth [P-2454C]
    Whitecap

    Whitecap C.P. Brass Outlet 2-3/4" Base 1" Depth [P-2454C]

    $49.11
    $65.95
    $49.11
    Desription - C.P. Brass 1/2" FIPT x 3/4" GHT outlet Base diameter - 2-3/4" Depth - 1" Fastener - #6 (3)WARNING: This product can expose you to chemicals including LEAD which is known to the State of California to cause cancer, birth defects or...
    $49.11
    $65.95
    $49.11
  • GROCO Bronze Clam Shell Style Hull Strainer w/Mount Ring f/Up To 1" Thru Hull [SC-1000]
    GROCO

    GROCO Bronze Clam Shell Style Hull Strainer w/Mount Ring f/Up To 1" Thru Hull [SC-1000]

    $68.76
    $102.45
    $68.76
    Bronze Clam Shell Style Hull Strainer w/Mount Ring f/Up To 1" Thru Hull Features: Mount ring design allows easy access to Thru Hulls. C84400 bronze body and door. Cast filter slots. Pressure relief holes in door casting. Specifications: Flow Type: STD Mount Ring Incl.: YES...
    $68.76
    $102.45
    $68.76
  • Whitecap C.P. Brass Sillcock 1-5/8" Base 3-3/16 Depth [P-2452C]
    Whitecap

    Whitecap C.P. Brass Sillcock 1-5/8" Base 3-3/16 Depth [P-2452C]

    $44.90
    $66.65
    $44.90
    Description - C.P. Brass Raw Water Washdown Base diameter- 1-5/8" Depth - 3-3/16" Threads - 1/2" FIPT x 3/4" Fastener - #6 (2)WARNING: This product can expose you to chemicals including LEAD which is known to the State of California to cause cancer, birth...
    $44.90
    $66.65
    $44.90
  • Perko Gas Tank Vent w/Swivel Elbow - Chrome/Black [0561DP4CHR]
    Perko

    Perko Gas Tank Vent w/Swivel Elbow - Chrome/Black [0561DP4CHR]

    $25.25
    $38.79
    $25.25
    Gas Tank Vent w/Swivel Elbow - Chrome/BlackFeatures: Chrome Plated Zinc Alloy Cap with Zinc Alloy Elbow Black or White Polymer Splash Guards Removable 30 Mesh Stainless Steel Wire Screen Flame Arrestor - for use with fuel applications Design Allows Elbow to be Rotated to...
    $25.25
    $38.79
    $25.25
  • Perko 4" Round Bronze Strainer MADE IN THE USA [0086DP4PLB]
    Perko

    Perko 4" Round Bronze Strainer MADE IN THE USA [0086DP4PLB]

    $36.48
    $77.74
    $36.48
    Perko 4" Round Bronze StrainerCast bronzeDrilled holesTechnical Information: For Thru-Hull Size Inches: 1-1/4 & 1-1/2 O.D. Inches: 4 I.D. Inches: 3 Model Number: 0086DP4PLB Screw Size: 8 Ship Weight: 2.9/2.8 lbs. MADE IN THE USA Specifications: Construction: Bronze Box Dimensions: 1"H x 4"W x...
    $36.48
    $77.74
    $36.48
  • Perko 1-1/4" Seacock Ball Valve Bronze MADE IN THE USA [0805007PLB]
    Perko

    Perko 1-1/4" Seacock Ball Valve Bronze MADE IN THE USA [0805007PLB]

    $294.71
    $662.60
    $294.71
    Perko 1-1/4" Seacock Ball Valve BronzeThese valve bodies are offered to meet the needs of applications thatrequire extra long, scoop or flush type thru-hulls.Cast Bronze.Technical Information: Flange Diameter Inches: 4-7/8" Overall Height Inches: 4-1/4" Pipe Size Inches: 1-1/4" Model Number: 0805007PLB Ship Weight: 5.3...
    $294.71
    $662.60
    $294.71
  • Perko 3/4" Pipe To Hose Adapter 90 Degree Bronze MADE IN THE USA [0063DP5PLB]
    Perko

    Perko 3/4" Pipe To Hose Adapter 90 Degree Bronze MADE IN THE USA [0063DP5PLB]

    $26.65
    $44.53
    $26.65
    Perko 3/4" Pipe To Hose Adapter 90 Degree BronzeCast BronzeCast hex for easier installationCurved 90 degreesTechnical Information: Pipe Size Inches: 3/4 Hose Size Inches: 3/4 Length Overall Inches: 4-1/2 Model Number: 0063DP5PLB Ship Weight: 2.1/9.1 *The above item meets the requirements of U.S.C.G. Safety...
    $26.65
    $44.53
    $26.65
  • GROCO 1/4" NPT #316 Stainless Steel In-Line Ball Valve [IBV-250-S]
    GROCO

    GROCO 1/4" NPT #316 Stainless Steel In-Line Ball Valve [IBV-250-S]

    $53.32
    $80.00
    $53.32
    1/4" NPT #316 Stainless Steel In-Line Ball ValveFeatures: 1-1/4" sizes and larger include a grease zerk fitting for lubrication (use only with the valve in the open position) or for draining Handle has square hole to accept standard ratchet (helps you to reach hard-to-reach...
    $53.32
    $80.00
    $53.32
  • GROCO Backing Block f/1-1/4" 1-1/2" Seacocks [BB-2]
    GROCO

    GROCO Backing Block f/1-1/4" 1-1/2" Seacocks [BB-2]

    $84.19
    $126.31
    $84.19
    Backing Block for 1-1/4" & 1-1/2" SeacocksFeatures: Each size fits multiple seacock sizes Press threaded brass inserts into the hull side of the backing block into the holes that match the seacock flange Rigid 1/2" thickness provides secure installation but is flexible enough to...
    $84.19
    $126.31
    $84.19
  • GROCO 1-1/4" Bronze Tri-Flanged Ball Valve/Seacock [FBV-1250]GROCO 1-1/4" Bronze Tri-Flanged Ball Valve/Seacock [FBV-1250]
    GROCO

    GROCO 1-1/4" Bronze Tri-Flanged Ball Valve/Seacock [FBV-1250]

    $158.58
    $237.18
    $158.58
    1-1/4" Bronze Tri-Flanged Ball Valve/SeacockFeatures: 1-1/4" sizes and larger include one grease zerk fitting for lubrication (use only with the valve in the open position), and one drain plug The zerk can also be used for draining Field reversible handle allows you to select...
    $158.58
    $237.18
    $158.58