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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 1-1/2" Bronze Tri-Flanged Ball Valve/Seacock [FBV-1500]GROCO 1-1/2" Bronze Tri-Flanged Ball Valve/Seacock [FBV-1500]
    GROCO

    GROCO 1-1/2" Bronze Tri-Flanged Ball Valve/Seacock [FBV-1500]

    $223.38
    $334.37
    $223.38
    1-1/2" 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...
    $223.38
    $334.37
    $223.38
  • Viega MegaPress 316 FKM 3/4" Cap [91820]
    Viega

    Viega MegaPress 316 FKM 3/4" Cap [91820]

    $61.31
    $143.18
    $61.31
    MegaPress 316 FKM 3/4" CapFeatures: For use with Sch. 5 to Sch. 40 stainless steel pipe 316 stainless steel Press connection Components:FKM sealing element, grip ring, separator ring Specifications: Construction: Stainless Steel Box Dimensions: 2"H x 2"W x 3"L WT: 0.3 lbs
    $61.31
    $143.18
    $61.31
  • 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]

    $80.29
    $123.50
    $80.29
    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)
    $80.29
    $123.50
    $80.29
  • Perko Fuel System Locking Cap f/ 1-1/2" Non-Vented Fills [1324DP0BLK]
    Perko

    Perko Fuel System Locking Cap f/ 1-1/2" Non-Vented Fills [1324DP0BLK]

    $49.63
    $76.25
    $49.63
    Fuel System Locking Cap f/ 1-1/2" Non-Vented Fills(1324) Black Plastic with Gasket Built in Lock Cylinder Size #0 Fits PERKO Fills 1313 & 1399 Cap Outside Thread Diameter: 1-15/32" Specifications: Construction: Plastic Box Dimensions: 2"H x 3"W x 6"L WT: 0.15 lbs UPC: 085226029707...
    $49.63
    $76.25
    $49.63
  • GROCO 6-Port NPT Bronze Fuel Valve 1/2" Main - 3/8" Return [FV-65038]
    GROCO

    GROCO 6-Port NPT Bronze Fuel Valve 1/2" Main - 3/8" Return [FV-65038]

    $280.33
    $436.58
    $280.33
    6-Port NPT Bronze Fuel Valve 1/2" Main - 3/8" ReturnFeatures: "L" Flow Pattern Mount feet included C84400 bronze construction Both 1/2" main 3/8" return and 1" main 3/4" return options available Specifications: Construction: Bronze Box Dimensions: 5"H x 5"W x 10"L WT: 3.05 lbs...
    $280.33
    $436.58
    $280.33
  • GROCO 1-1/2"" NPT x 1-1/2" ID Stainless Steel Pipe to Hose Straight Fitting [PTH-1500-S]
    GROCO

    GROCO 1-1/2"" NPT x 1-1/2" ID Stainless Steel Pipe to Hose Straight Fitting [PTH-1500-S]

    $37.95
    $55.48
    $37.95
    1-1/2"" NPT x 1-1/2" ID Stainless Steel Pipe to Hose Straight Fitting Features: Male NPT x Hose connection #316 Stainless Steel Sizes from 1/2" to 3" Standard Flow NSF-61 compliant Suitable for use in potable water systems Specifications: Construction: Stainless Steel Box Dimensions: 3"H x...
    $37.95
    $55.48
    $37.95
  • GROCO 1/2" NPT x 1/2" ID Bronze Pipe to Hose Straight Fitting [PTH-500]
    GROCO

    GROCO 1/2" NPT x 1/2" ID Bronze Pipe to Hose Straight Fitting [PTH-500]

    $8.75
    $13.14
    $8.75
    1/2" NPT x 1/2" ID Bronze Pipe to Hose Straight FittingFeatures: Male NPT x Hose connection C83600 Bronze Sizes from 1/2" to 5" Standard Flow UL Listed 647B Note- C83600 bronze fittings are not in compliance with NSF-61 and therefore are not intended for use...
    $8.75
    $13.14
    $8.75
  • GROCO 1-1/4" Hose Barb Stainless Straight Deck Drain [SCUS-1250]GROCO 1-1/4" Hose Barb Stainless Straight Deck Drain [SCUS-1250]
    GROCO

    GROCO 1-1/4" Hose Barb Stainless Straight Deck Drain [SCUS-1250]

    $146.00
    $217.56
    $146.00
    1-1/4" Hose Barb Stainless Straight Deck Drain Features: Scuppers are installed flush with the deck and have a removable drain. #316 Stainless Steel Thru Deck Drain with Bronze Hose Connection Specifications: Construction: Stainless Steel Box Dimensions: 2"H x 4"W x 8"L WT: 1.5 lbs UPC:...
    $146.00
    $217.56
    $146.00
  • GROCO 1" Bronze NPS to NPT Flange Adapter [IBVF-1000]
    GROCO

    GROCO 1" Bronze NPS to NPT Flange Adapter [IBVF-1000]

    $75.91
    $113.89
    $75.91
    1" Bronze NPS to NPT Flange AdapterIBVF Flanged Adapters have been developed to address several common problems in the marine industry.  Features:   Eliminate dangerous thread miss-match when in-line valves are screwed onto thru hulls Accept standard thru-hulls into the base and standard in-line...
    $75.91
    $113.89
    $75.91
  • 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]

    $59.85
    $69.34
    $59.85
    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...
    $59.85
    $69.34
    $59.85
  • GROCO 1-1/2" NPT Bronze In-Line Ball Valve [IBV-1500]
    GROCO

    GROCO 1-1/2" NPT Bronze In-Line Ball Valve [IBV-1500]

    $157.68
    $235.08
    $157.68
    1-1/2" NPT Bronze In-Line Ball ValveFeatures: Female NPT Threads 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 Selectable handle rotation Handle has square hole to accept standard ratchet to...
    $157.68
    $235.08
    $157.68
  • Perko 0582 Style Replacement Cap w/Inserts [0582DPS99A]
    Perko

    Perko 0582 Style Replacement Cap w/Inserts [0582DPS99A]

    $74.45
    $108.71
    $74.45
    0582 Style Replacement Cap with Inserts Replacement cap for fuel systems. Includes inserts - Gas - Diesel - Water Features: Scalloped Stainless Steel vented cap complete with O-Ring The replacement gas cap is NOT for use with EPA Compliant sealed fuel systems *Sold as an Individual Brochure...
    $74.45
    $108.71
    $74.45
  • Perko Spare Cap f/1313 Gas Fill [0126DP0BLK]
    Perko

    Perko Spare Cap f/1313 Gas Fill [0126DP0BLK]

    $17.51
    $24.73
    $17.51
    Spare Cap f/1313 Gas FillNon-Locking Spare Cap f/1313 Gas Fill
    $17.51
    $24.73
    $17.51
  • Perko Flush Pro Valve - 1" [0456DP6]
    Perko

    Perko Flush Pro Valve - 1" [0456DP6]

    $176.66
    $240.88
    $176.66
    Flush Pro Valve - 1"Finally! Freshwater flushing of your inboard is as simple as connecting a garden hose.Features: Polymer Stainless Steel Spring Flush your boat engine safely and easily Transparent body allows for visual inspection of water flow Durable check valve system activated by...
    $176.66
    $240.88
    $176.66
  • Perko Flush Pro Valve - 1-1/4" [0456DP7]
    Perko

    Perko Flush Pro Valve - 1-1/4" [0456DP7]

    $176.66
    $240.88
    $176.66
    Flush Pro Valve - 1-1/4"Finally! Freshwater flushing of your inboard is as simple as connecting a garden hose.Features: Polymer Stainless Steel Spring Flush your boat engine safely and easily Transparent body allows for visual inspection of water flow Durable check valve system activated by...
    $176.66
    $240.88
    $176.66
  • Perko Gas Tank Vent w/Splash Guard - Chrome Plated Zinc - " Hose [0506DP4CHR]
    Perko

    Perko Gas Tank Vent w/Splash Guard - Chrome Plated Zinc - " Hose [0506DP4CHR]

    $26.27
    $38.43
    $26.27
    Gas Tank Vent Chrome Plated Zinc Alloy with Black Polymer Splash Guard Removable 30 Mesh Stainless Steel Wire Screen Flame Arrestor - for use with fuel applications Hose Size: 5/8" Max Hull Thickness: 3/4"
    $26.27
    $38.43
    $26.27
  • Perko Flush Pro Valve Kit - 1-1/4" [0457DP7]
    Perko

    Perko Flush Pro Valve Kit - 1-1/4" [0457DP7]

    $283.25
    $404.00
    $283.25
    Flush Pro Valve Kit - 1-1/4"Finally! Freshwater flushing of your inboard is as simple as connecting a garden hose.Features: Polymer Stainless Steel Spring Flush your boat engine safely and easily Transparent body allows for visual inspection of water flow Durable check valve system activated...
    $283.25
    $404.00
    $283.25
  • Perko Flush Pro Valve - 5/8" [0456DP4]
    Perko

    Perko Flush Pro Valve - 5/8" [0456DP4]

    $176.66
    $240.88
    $176.66
    Flush Pro Valve - 5/8"Finally! Fresh flushing of your inboard is as simple as connecting a garden hose.Features: Polymer Stainless Steel Spring Flush your boat engine safely and easily Transparent body allows for visual inspection of water flow Durable check valve system activated by...
    $176.66
    $240.88
    $176.66
  • GROCO 3/4" NPT Bronze In-Line Ball Valve [IBV-750]
    GROCO

    GROCO 3/4" NPT Bronze In-Line Ball Valve [IBV-750]

    $45.25
    $67.17
    $45.25
    3/4" NPT Bronze In-Line Ball ValveFeatures: Female NPT Threads 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 Selectable handle rotation Handle has square hole to accept standard ratchet to...
    $45.25
    $67.17
    $45.25
  • GROCO 3/4" Bronze NPS to NPT Flange Adapter [IBVF-750]
    GROCO

    GROCO 3/4" Bronze NPS to NPT Flange Adapter [IBVF-750]

    $70.07
    $105.13
    $70.07
    3/4" Bronze NPS to NPT Flange AdapterIBVF Flanged Adapters have been developed to address several common problems in the marine industry.  Features:   Eliminate dangerous thread miss-match when in-line valves are screwed onto thru hulls Accept standard thru-hulls into the base and standard in-line...
    $70.07
    $105.13
    $70.07