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Premium Marine Quality Parts

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Groco Cv Bronze In-Line Check Valve - Cv-50 - 34-Cv50F1

Groco, Hoses, Clamps & Fittings
$42.49

In-line check valve may be used in water or fuel systems to keep pumps primed and to prevent back-flow in pressure systems. Unique design reduces flow turbulence and restriction, and improves pump performance. Cast bronze construction. NPT threaded ports. NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Cv Bronze In-Line Check Valve - Cv-200 - 34-Cv200F1

Groco, Hoses, Clamps & Fittings
$285.19

In-line check valve may be used in water or fuel systems to keep pumps primed and to prevent back-flow in pressure systems. Unique design reduces flow turbulence and restriction, and improves pump performance. Cast bronze construction. NPT threaded ports. NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Cv Bronze In-Line Check Valve - Cv-150 - 34-Cv150F1

Groco, Hoses, Clamps & Fittings
$191.79

In-line check valve may be used in water or fuel systems to keep pumps primed and to prevent back-flow in pressure systems. Unique design reduces flow turbulence and restriction, and improves pump performance. Cast bronze construction. NPT threaded ports. NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Cv Bronze In-Line Check Valve - Cv-125 - 34-Cv125F1

Groco, Hoses, Clamps & Fittings
$125.99

In-line check valve may be used in water or fuel systems to keep pumps primed and to prevent back-flow in pressure systems. Unique design reduces flow turbulence and restriction, and improves pump performance. Cast bronze construction. NPT threaded ports. NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Cv Bronze In-Line Check Valve - Cv-100 - 34-Cv100F1

Groco, Hoses, Clamps & Fittings
$67.29

In-line check valve may be used in water or fuel systems to keep pumps primed and to prevent back-flow in pressure systems. Unique design reduces flow turbulence and restriction, and improves pump performance. Cast bronze construction. NPT threaded ports. NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Cp-20 12V Centrifugal Pump 17 Gpm - Cp-20 12V - 34-Cp20F1

Groco, Miscellaneous
$643.19

Ideal for baitwell or any onboard pumping job that needs high flow and low pressure. Includes garden hose adapter. Motor is ignition protected. Includes an adapter for garden hose conection.NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco C-60 12V Deck Wash Kit With Pgn-50 Spray Nozzle And Cv-75 Check Valve - C-60 12V - 34-C6012Vf1

Groco, Hoses, Clamps & Fittings
$1,269.99

Completely assembled and water tested salt water washdown system provides pressurized water on demand. For deck, anchor wash, or both. Features permanent magnet ball bearing motor, SPO-60-N vane pump, P-9021 in-line check valve and PGN-50 salt water nozzle. Coupled to combination check valve/pressure switch assembly. Mounted on a ready to install platform. Use PST-1 pressure storage tank to reduce pump cycling. PSI range is 15-35. Size: 9-1/2" L x 6-1/2" W x 4-3/4" H. NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Bvs2 Seacock/Strainer Combo - Bvs-2 - 34-Bvs2F1

Groco, Thru-Hulls & Seacocks
$48.09

Service Repair kit contains sight glass gaskets, cap o-ring, and valve driver seals

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Groco Bvs Bronze Ball Valve/Strainer Combo 3/4" - Bvs-750 - 34-Bvs750F1

Groco, Thru-Hulls & Seacocks
$1,221.99

For most air conditioning, refrigeration, generator and small main engine raw water supply. Combines raw water strainer with full flow seacock to simplify installation and maintenance. Features bronze castings, SS full flow ball, full flow pipe size, 1/4" turn open/close, no internal tie rods and filter basket material is #304 SS. Strainer top may be rotated in 90° increments to simplify plumbing.NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Bvs Bronze Ball Valve/Strainer Combo 1" - Bvs-1000 - 34-Bvs1000F1

Groco, Thru-Hulls & Seacocks
$1,594.49

For most air conditioning, refrigeration, generator and small main engine raw water supply. Combines raw water strainer with full flow seacock to simplify installation and maintenance. Features bronze castings, SS full flow ball, full flow pipe size, 1/4" turn open/close, no internal tie rods and filter basket material is #304 SS. Strainer top may be rotated in 90° increments to simplify plumbing.NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Bvs Bronze Ball Valve/Strainer Combo 1-1/4" - Bvs-1250 - 34-Bvs1250F1

Groco, Thru-Hulls & Seacocks
$2,084.99

For most air conditioning, refrigeration, generator and small main engine raw water supply. Combines raw water strainer with full flow seacock to simplify installation and maintenance. Features bronze castings, SS full flow ball, full flow pipe size, 1/4" turn open/close, no internal tie rods and filter basket material is #304 SS. Strainer top may be rotated in 90° increments to simplify plumbing.NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Bvs Bronze Ball Valve/Strainer Combo 1-1/2" - Bvs-1500 - 34-Bvs1500F1

Groco, Thru-Hulls & Seacocks
$2,441.39

For most air conditioning, refrigeration, generator and small main engine raw water supply. Combines raw water strainer with full flow seacock to simplify installation and maintenance. Features bronze castings, SS full flow ball, full flow pipe size, 1/4" turn open/close, no internal tie rods and filter basket material is #304 SS. Strainer top may be rotated in 90° increments to simplify plumbing.NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Bv Bronze Full-Flow Flanged Ball-Type Seacock - Bv-750 - 34-Bv750F1

Groco, Thru-Hulls & Seacocks
$495.99

Features patented field-selectable and changeable direction of rotation-permits installation in otherwise unusable locations. Tri-flange base and mount hole pattern provide easy retrofit when replacing most popular brands. Handle has a square hole that accepts standard ratchet-helps to reach hard-to-reach valves, and eases operation of hard to actuate valves. Stainless steel ball and stem, PTFE seats and seals. Serviceable when installed, drain plug on both sides for efficient winterization. NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Bv Bronze Full-Flow Flanged Ball-Type Seacock - Bv-4000 - 34-Bv4000F1

Groco, Thru-Hulls & Seacocks
$6,422.79

Features patented field-selectable and changeable direction of rotation-permits installation in otherwise unusable locations. Tri-flange base and mount hole pattern provide easy retrofit when replacing most popular brands. Handle has a square hole that accepts standard ratchet-helps to reach hard-to-reach valves, and eases operation of hard to actuate valves. Stainless steel ball and stem, PTFE seats and seals. Serviceable when installed, drain plug on both sides for efficient winterization. NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Bv Bronze Full-Flow Flanged Ball-Type Seacock - Bv-3000 - 34-Bv3000F1

Groco, Thru-Hulls & Seacocks
$3,031.69

Features patented field-selectable and changeable direction of rotation-permits installation in otherwise unusable locations. Tri-flange base and mount hole pattern provide easy retrofit when replacing most popular brands. Handle has a square hole that accepts standard ratchet-helps to reach hard-to-reach valves, and eases operation of hard to actuate valves. Stainless steel ball and stem, PTFE seats and seals. Serviceable when installed, drain plug on both sides for efficient winterization. NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Bv Bronze Full-Flow Flanged Ball-Type Seacock - Bv-2500 - 34-Bv2500F1

Groco, Thru-Hulls & Seacocks
$1,943.99

Features patented field-selectable and changeable direction of rotation-permits installation in otherwise unusable locations. Tri-flange base and mount hole pattern provide easy retrofit when replacing most popular brands. Handle has a square hole that accepts standard ratchet-helps to reach hard-to-reach valves, and eases operation of hard to actuate valves. Stainless steel ball and stem, PTFE seats and seals. Serviceable when installed, drain plug on both sides for efficient winterization. NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Bv Bronze Full-Flow Flanged Ball-Type Seacock - Bv-2000 - 34-Bv2000F1

Groco, Thru-Hulls & Seacocks
$1,217.49

Features patented field-selectable and changeable direction of rotation-permits installation in otherwise unusable locations. Tri-flange base and mount hole pattern provide easy retrofit when replacing most popular brands. Handle has a square hole that accepts standard ratchet-helps to reach hard-to-reach valves, and eases operation of hard to actuate valves. Stainless steel ball and stem, PTFE seats and seals. Serviceable when installed, drain plug on both sides for efficient winterization. NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Bv Bronze Full-Flow Flanged Ball-Type Seacock - Bv-1500 - 34-Bv1500F1

Groco, Thru-Hulls & Seacocks
$865.99

Features patented field-selectable and changeable direction of rotation-permits installation in otherwise unusable locations. Tri-flange base and mount hole pattern provide easy retrofit when replacing most popular brands. Handle has a square hole that accepts standard ratchet-helps to reach hard-to-reach valves, and eases operation of hard to actuate valves. Stainless steel ball and stem, PTFE seats and seals. Serviceable when installed, drain plug on both sides for efficient winterization. NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Bv Bronze Full-Flow Flanged Ball-Type Seacock - Bv-1250 - 34-Bv1250F1

Groco, Thru-Hulls & Seacocks
$767.59

Features patented field-selectable and changeable direction of rotation-permits installation in otherwise unusable locations. Tri-flange base and mount hole pattern provide easy retrofit when replacing most popular brands. Handle has a square hole that accepts standard ratchet-helps to reach hard-to-reach valves, and eases operation of hard to actuate valves. Stainless steel ball and stem, PTFE seats and seals. Serviceable when installed, drain plug on both sides for efficient winterization. NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Bv Bronze Full-Flow Flanged Ball-Type Seacock - Bv-1000 - 34-Bv1000F1

Groco, Thru-Hulls & Seacocks
$597.49

Features patented field-selectable and changeable direction of rotation-permits installation in otherwise unusable locations. Tri-flange base and mount hole pattern provide easy retrofit when replacing most popular brands. Handle has a square hole that accepts standard ratchet-helps to reach hard-to-reach valves, and eases operation of hard to actuate valves. Stainless steel ball and stem, PTFE seats and seals. Serviceable when installed, drain plug on both sides for efficient winterization. NOT TO BE USED IN POTABLE WATER SYSTEMS.

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Groco Bm5 Monel Filter Basket - Bm-5 - 34-Bm5F1

Groco, Filters, Oils & Lubricants
$361.69

Spare Basket

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Groco Bm3 Monel Filter Basket - Bm-3 - 34-Bm3F1

Groco, Filters, Oils & Lubricants
$283.69

Spare Basket

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Groco Bm2 Monel Filter Basket - Bm-2 - 34-Bm2F1

Groco, Filters, Oils & Lubricants
$232.99

Spare Basket

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Groco Bm11 Monel Filter Basket - Bm-11 - 34-Bm11F1

Groco, Filters, Oils & Lubricants
$559.29

Spare Basket

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Groco Bb Backing Block For Flanged Seacock - Bb-3 - 34-Bb3F1

Groco, Thru-Hulls & Seacocks
$148.69

Flanged seacock installation is improved with the use of a backing block between the valve flange and the hull. Each size fits multiple seacock sizesPress threaded inserts into the hull side of the backing block into the holes that match the seacock flange1/2" thickness is rigid enough for a secure installation but flexible enough to conform to minor hull curvatureWill not swell or absorb moistureMade from an environmentally friendly PVC foam specially formulated for marine applications

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Northern Marine Canada
Our products are shipped from Canada!
Parts Warehouse:
Toronto, Ontario, Canada
Head Office:
Kingston, Ontario

About Us

Northern Marine is a Canadian supplier of premium marine and RV parts and accessories from top industry brands. We focus on quality, accurate listings, and dependable fulfillment so you can maintain, repair, and outfit your boat or RV with confidence.

Our goal is simple: get you the right parts, shipped fast, with straightforward service you can count on.