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Marine Plumbing & Ventilation - Fittings

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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 1-1/4" 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]

    $144.44
    $215.24
    $144.44
    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:...
    $144.44
    $215.24
    $144.44
  • 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]

    $59.21
    $68.60
    $59.21
    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...
    $59.21
    $68.60
    $59.21
  • 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]

    $156.00
    $232.58
    $156.00
    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...
    $156.00
    $232.58
    $156.00
  • Perko 0582 Style Replacement Cap w/Inserts [0582DPS99A]
    Perko

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

    $73.66
    $107.55
    $73.66
    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...
    $73.66
    $107.55
    $73.66
  • Perko Spare Cap f/1313 Gas Fill [0126DP0BLK]
    Perko

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

    $17.32
    $24.47
    $17.32
    Spare Cap f/1313 Gas FillNon-Locking Spare Cap f/1313 Gas Fill
    $17.32
    $24.47
    $17.32
  • Perko Flush Pro Valve - 1" [0456DP6]
    Perko

    Perko Flush Pro Valve - 1" [0456DP6]

    $174.78
    $238.31
    $174.78
    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...
    $174.78
    $238.31
    $174.78
  • Perko Flush Pro Valve - 1-1/4" [0456DP7]
    Perko

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

    $174.78
    $238.31
    $174.78
    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...
    $174.78
    $238.31
    $174.78
  • 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]

    $25.99
    $38.02
    $25.99
    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"
    $25.99
    $38.02
    $25.99
  • Perko Flush Pro Valve Kit - 1-1/4" [0457DP7]
    Perko

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

    $280.23
    $399.70
    $280.23
    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...
    $280.23
    $399.70
    $280.23
  • Perko Flush Pro Valve - 5/8" [0456DP4]
    Perko

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

    $174.78
    $238.31
    $174.78
    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...
    $174.78
    $238.31
    $174.78
  • GROCO 3/4" NPT Bronze In-Line Ball Valve [IBV-750]
    GROCO

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

    $44.77
    $66.45
    $44.77
    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...
    $44.77
    $66.45
    $44.77
  • GROCO 3/4" Bronze NPS to NPT Flange Adapter [IBVF-750]
    GROCO

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

    $69.33
    $104.01
    $69.33
    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...
    $69.33
    $104.01
    $69.33
  • GROCO 1-1/4" NPT x 1-1/2" Bronze Full Flow Pipe to Hose Straight Fitting [FF-1250]
    GROCO

    GROCO 1-1/4" NPT x 1-1/2" Bronze Full Flow Pipe to Hose Straight Fitting [FF-1250]

    $33.21
    $49.12
    $33.21
    1-1/4" NPT x 1-1/2" Bronze Full Flow Pipe to Hose Straight FittingFeatures: Full Flow Male NPT x Hose connection C83600 Bronze Sizes from 1/2" to 3" UL Listed 647B Note- C83600 bronze fittings are not in compliance with NSF-61 and therefore are not intended for...
    $33.21
    $49.12
    $33.21
  • Perko Cover Bolt Complete Sizes 8, 9 10 [0493DP999L]
    Perko

    Perko Cover Bolt Complete Sizes 8, 9 10 [0493DP999L]

    $53.43
    $80.72
    $53.43
    Cover Bolt Complete Sizes 8, 9 & 10Cover Bolt Only (Size 8, 9 and 10) for Intake Water Strainer.Intake Water Strainers are designed for easy installation and cleaning. Features include mounting lugs cast into both sides to assure universal mounting, four outside tie rods...
    $53.43
    $80.72
    $53.43
  • Johnson Pump Bulkhead Fitting 3/4" Hose [09-10616]
    Johnson Pump

    Johnson Pump Bulkhead Fitting 3/4" Hose [09-10616]

    $44.77
    $74.76
    $44.77
    Bulkhead FittingPart #: 09-10616Johnson Bulkhead Fitting for 3/4" hose
    $44.77
    $74.76
    $44.77
  • GROCO 3" Full Flow Ball Valve [FBV-3000]GROCO 3" Full Flow Ball Valve [FBV-3000]
    GROCO

    GROCO 3" Full Flow Ball Valve [FBV-3000]

    $830.62
    $1,298.68
    $830.62
    3" Full Flow Ball ValveThis GROCO flanged ball valve is designed for controlling the flow and pressure of fluids in a pipeline system.Features: 1-1/4" sizes and larger include one grease zerk fitting for lubrication (use only with the valve in the open position), and...
    $830.62
    $1,298.68
    $830.62
  • Albin Group Solenoid Valve - 12V [07-66-035]Albin Group Solenoid Valve - 12V [07-66-035]
    Albin Group

    Albin Group Solenoid Valve - 12V [07-66-035]

    $44.77
    $61.83
    $44.77
    Solenoid Valve - 12V12V Electric Valve to be used with centralized fresh water system. Features:Certification: CE marked 94/25/ECC, ISO8846 Small Craft, Electromagnetic compatibility 89/336/EEC, EN51014 1993/radio disturbance
    $44.77
    $61.83
    $44.77
  • Scandvik 3/8" BSP x 1/2" NPT - Brass [10002]
    Scandvik

    Scandvik 3/8" BSP x 1/2" NPT - Brass [10002]

    $23.10
    $33.59
    $23.10
    3/8" BSP x 1/2" NPT - BrassAdapters convert 3/8” BSP-M to 1/2” NPT-M or 1/2" NPS-M. Washers included.Specifications: Material: Brass Brass Thread Type: 3/8” BSP-F and 1/2” NPT-M
    $23.10
    $33.59
    $23.10
  • GROCO 1-1/2" NPT Bronze 3-Way Valve [TWV-1500]
    GROCO

    GROCO 1-1/2" NPT Bronze 3-Way Valve [TWV-1500]

    $307.68
    $479.60
    $307.68
    1-1/2" 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.  TWV-1500 size...
    $307.68
    $479.60
    $307.68
  • GROCO 1-1/4" Safety Seacock w/1" Side Port [SBV-1250-P]
    GROCO

    GROCO 1-1/4" Safety Seacock w/1" Side Port [SBV-1250-P]

    $752.61
    $1,339.12
    $752.61
    1-1/4" Safety Seacock w/1" Side Port Features: Two driver ports permit handle relocation. NPT threaded side port accepts SSCV or any NPT threaded accessory. Handle has square hole that accepts standard ratchet; helps access hard-to-reach valves, or ease actuation of hard-to-operate valves. Full flow. Serviceable...
    $752.61
    $1,339.12
    $752.61