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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 Bronze Pipe Nipple - 2-1/2" NPT [PN-2500]
    GROCO

    GROCO Bronze Pipe Nipple - 2-1/2" NPT [PN-2500]

    £40.58
    £60.12
    £40.58
    Bronze Pipe Nipple - 2-1/2" NPT Features: Cast-in wrench flat simplifies installation and removal NPT x NPT Connection C83600 Bronze   Full flow   Note-C83600 bronze fittings are not in compliance with NSF-61 and therefore are not intended for use in potable water systems. Specifications:...
    £40.58
    £60.12
    £40.58
  • GROCO Bronze Round Hull Strainer w/Access Door f/Up To 1" Thru-Hull [RSC-1000]
    GROCO

    GROCO Bronze Round Hull Strainer w/Access Door f/Up To 1" Thru-Hull [RSC-1000]

    £46.59
    £69.14
    £46.59
    Bronze Round Hull Strainer with Access Door for Up To 1" Thru-HullFeatures: Patented access door design allows easy access to Thru Hulls. C84400 bronze body and door. Cast filter holes. Designed for systems where forced flow is not needed or wanted. Specifications: Max T-Hull:...
    £46.59
    £69.14
    £46.59
  • GROCO 3/4" Bronze Flanged Full Flow Seacock [BV-750]
    GROCO

    GROCO 3/4" Bronze Flanged Full Flow Seacock [BV-750]

    £181.87
    £284.09
    £181.87
    3/4" Bronze Flanged Full Flow 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. Tri-flange base and mount hole pattern...
    £181.87
    £284.09
    £181.87
  • GROCO Garboard Drain w/Inside T-Handle Plug [TD-750]
    GROCO

    GROCO Garboard Drain w/Inside T-Handle Plug [TD-750]

    £53.35
    £79.66
    £53.35
    Garboard Drain w/Inside T-Handle Plug The ConceptBronze Garboard DrainOnce your boat is in its cradle, sling, lift, or trailer, draining the bilge is easy with a garboard drain. All models install from the outside.
    £53.35
    £79.66
    £53.35
  • GROCO 1" NPT x 1" ID Bronze Pipe to Hose Straight Fitting [PTH-1000]
    GROCO

    GROCO 1" NPT x 1" ID Bronze Pipe to Hose Straight Fitting [PTH-1000]

    £9.01
    £12.78
    £9.01
    1" NPT x 1" 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...
    £9.01
    £12.78
    £9.01
  • GROCO 1/2" NPT x 3/4" Bronze Full Flow Pipe to Hose Straight Fitting [FF-500]
    GROCO

    GROCO 1/2" NPT x 3/4" Bronze Full Flow Pipe to Hose Straight Fitting [FF-500]

    £6.76
    £9.77
    £6.76
    1/2" NPT x 3/4" 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...
    £6.76
    £9.77
    £6.76
  • GROCO 1-1/4" NPT x 1-1/2" ID Bronze Full Flow 90 Elbow Pipe to Hose Fitting [FFC-1250]
    GROCO

    GROCO 1-1/4" NPT x 1-1/2" ID Bronze Full Flow 90 Elbow Pipe to Hose Fitting [FFC-1250]

    £34.56
    £51.11
    £34.56
    1-1/4" NPT x 1-1/2" ID Bronze Full Flow 90° Elbow Pipe to Hose FittingFeatures: 90 degree Male NPT x Hose connection C83600 Bronze Sizes from 1/2" to 3" Full Flow UL Listed 647B Note- C83600 bronze fittings are not in compliance with NSF-61 and therefore...
    £34.56
    £51.11
    £34.56
  • Shurflo by Pentair Pressure Reducing City Water Entry - Wall Mount - Gel White [183-029-18]
    Shurflo by Pentair

    Shurflo by Pentair Pressure Reducing City Water Entry - Wall Mount - Gel White [183-029-18]

    £36.07
    £55.25
    £36.07
    Pressure Reducing City Water Entry - Wall Mount - Gel WhiteThis combination pressure reducing city water entry and check valve diaphragm design prevents high-pressure damage often caused by city water systems. This high performance water entry limits water pressure safely to 50 PSI while...
    £36.07
    £55.25
    £36.07
  • GROCO 1-1/4"" NPT x 1-1/4" ID Stainless Steel Pipe to Hose Straight Fitting [PTH-1250-S]
    GROCO

    GROCO 1-1/4"" NPT x 1-1/4" ID Stainless Steel Pipe to Hose Straight Fitting [PTH-1250-S]

    £15.02
    £22.55
    £15.02
    1-1/4"" NPT x 1-1/4" 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...
    £15.02
    £22.55
    £15.02
  • GROCO 1/4" NPT Bronze Inline Fuel Valve [FV-250]
    GROCO

    GROCO 1/4" NPT Bronze Inline Fuel Valve [FV-250]

    £15.02
    £22.55
    £15.02
    1/4" NPT Bronze Inline Fuel ValveFeatures: Selectable handle rotation Full flow Mount foot included C83600 bronze construction Stainless steel handle and hardware 400 WOG PTFE seats and seals UL listed for fuel or water Specifications: Construction: Bronze Box Dimensions: 2"H x 3"W x 5"L...
    £15.02
    £22.55
    £15.02
  • GROCO 1/2" NPT Stainless Steel In-Line Ball Valve [IBV-500-S]
    GROCO

    GROCO 1/2" NPT Stainless Steel In-Line Ball Valve [IBV-500-S]

    £38.32
    £57.12
    £38.32
    1/2" 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...
    £38.32
    £57.12
    £38.32
  • GROCO 1-1/2" NPT x 1-1/2" ID Bronze Pipe to Hose Straight Fitting [PTH-1500]
    GROCO

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

    £18.03
    £26.30
    £18.03
    1-1/2" NPT x 1-1/2" 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...
    £18.03
    £26.30
    £18.03
  • GROCO 2" NPT Bronze In-Line Ball Valve [IBV-2000]
    GROCO

    GROCO 2" NPT Bronze In-Line Ball Valve [IBV-2000]

    £136.02
    £212.69
    £136.02
    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...
    £136.02
    £212.69
    £136.02
  • Forespar Marelon Full-Flow Seacock 3/4" Mushroom Through-Hull [904043ABYC]
    Forespar Performance Products

    Forespar Marelon Full-Flow Seacock 3/4" Mushroom Through-Hull [904043ABYC]

    £62.37
    £90.15
    £62.37
    Marelon Full-Flow Seacock & 3/4" Mushroom Through-HullThis integrated 2-part system comes complete with a Marelon® valve and properly matched mushroom head thru-hull with super strong “buttress” type threading. This new package is designed to eliminate valve and thru-hull thread style mismatches and associated cross-threading...
    £62.37
    £90.15
    £62.37
  • Forespar Marelon Full-Flow Seacock 1/2" Mushroom Through-Hull [904042ABYC]
    Forespar Performance Products

    Forespar Marelon Full-Flow Seacock 1/2" Mushroom Through-Hull [904042ABYC]

    £60.12
    £87.14
    £60.12
    Marelon Full-Flow Seacock & 1/2" Mushroom Through-HullThis integrated 2-part system comes complete with a Marelon® valve and properly matched mushroom head thru-hull with super strong “buttress” type threading. This new package is designed to eliminate valve and thru-hull thread style mismatches and associated cross-threading...
    £60.12
    £87.14
    £60.12
  • Jabsco Port Kit 90-Degree Elbow 1/2" Hose Fitting - Pair [30651-1000]
    Jabsco

    Jabsco Port Kit 90-Degree Elbow 1/2" Hose Fitting - Pair [30651-1000]

    £6.76
    £9.01
    £6.76
    Port Kit 90-Degree Elbow 1/2" Hose Fitting - PairSpecifications: Pair of ports EDPM O-Ring Actual Weight: 0.01 Kg  (Approx. 0.21 Kg packed)
    £6.76
    £9.01
    £6.76
  • GROCO 1" NPT x 1-1/8" ID Bronze Full Flow 90 Elbow Pipe to Hose Fitting [FFC-1125]
    GROCO

    GROCO 1" NPT x 1-1/8" ID Bronze Full Flow 90 Elbow Pipe to Hose Fitting [FFC-1125]

    £19.53
    £29.31
    £19.53
    1" NPT x 1-1/8" ID Bronze Full Flow 90° Elbow Pipe to Hose FittingFeatures: 90 degree Male NPT x Hose connection C83600 Bronze Sizes from 1/2" to 3" Full Flow UL Listed 647B Note- C83600 bronze fittings are not in compliance with NSF-61 and therefore...
    £19.53
    £29.31
    £19.53
  • GROCO Bronze Clam Shell Style Hull Strainer w/Mount Ring f/Up To 1-1/2" Thru Hull [SC-1500]
    GROCO

    GROCO Bronze Clam Shell Style Hull Strainer w/Mount Ring f/Up To 1-1/2" Thru Hull [SC-1500]

    £74.40
    £111.23
    £74.40
    Bronze Clam Shell Style Hull Strainer w/Mount Ring f/Up To 1-1/2" 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...
    £74.40
    £111.23
    £74.40
  • GROCO 1-1/2" NPT Stainless Steel In-Line Ball Valve [IBV-1500-S]
    GROCO

    GROCO 1-1/2" NPT Stainless Steel In-Line Ball Valve [IBV-1500-S]

    £87.92
    £131.52
    £87.92
    1-1/2" 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...
    £87.92
    £131.52
    £87.92
  • Rule Replacement Garden Hose Adapter [68]
    Rule

    Rule Replacement Garden Hose Adapter [68]

    £8.26
    £9.76
    £8.26
    Hose AdapterReplacement Garden Hose Adapter
    £8.26
    £9.76
    £8.26