Marine Plumbing fittings for Boats - for use above and below the waterline - Forespar

Ball Valve

Bulkhead Fittings

Bungs & Drain Sockets

Elbows

Flange Mounting Seacocks

Flowtech Performance Valve

Marelon Integrated Plumbing

Miscellaneous Plumbing

Reducers & Adaptors

Scoop Strainers

Tailpipes & Hose Connectors

Thru-hull Connectors

Vented Loops

Water Strainer

Y-Valve and Connectors

Forespar Marelon Marine Plumbing provides strength, light weight and internationally approved underwater systems which will give you years of trouble free, corrosion free and electrolysis free use.

Marelon® is the modern material for marine plumbing systems. It's non-corrosive proprietary formulation polymer composite compounds uses resins and additives to produce a superior marine-grade product that will not deteriorate like traditional bronze marine plumbing parts.

The Marelon Integrated System valves were specifically designed for production boat builders. The complete system comes with a flush or mushroom head "buttress" threaded thru-hull for exceptional strength.

When the complete system is used Forespar supply an emergency thru-hull plug as a cap in the handle. All configurations meet or exceed ABYC standards, are U.L. Approved and ISO Certified.

To view Installation Instructions, Maintenance tips, Certifications and more visit the Forespar Marine Plumbing Catalogues and tech sheets section of our website.

498 Products Found

Flowtech Valve System, large

Flowtech Valve System, large

$373.80

MF 844 1" Vented Loop

MF 844 1" Vented Loop

From $76.45

MF 845 1/2" Vented Loop

MF 845 1/2" Vented Loop

From $61.20

MF 846 Vent Barb Assembly 1/4" barbs

MF 846 Vent Barb Assembly 1/4" barbs

$21.95

1" Flush Head Full Threaded Thru-hull CF 250

1" Flush Head Full Threaded Thru-hull CF 250

From $29.15

1" Hose Tailpipe Mushroom Head Thru-Hull

1" Hose Tailpipe Mushroom Head Thru-Hull

$31.80

1" Hose Tailpipe Screened Mushroom Head Thru-Hull

1" Hose Tailpipe Screened Mushroom Head Thru-Hull

$39.85

1" Mushroom Head Full Threaded Thru-Hull

1" Mushroom Head Full Threaded Thru-Hull

From $31.80

1" PTFE Ball Valve BSP MF 850

1" PTFE Ball Valve BSP MF 850

$141.35

1" PTFE Ball Valve MF 850

1" PTFE Ball Valve MF 850

From $141.35

1" Screened Flush Head Full Threaded Thru-hull CF 250

1" Screened Flush Head Full Threaded Thru-hull CF 250

$39.85

1-1/2" Flush Head Drain Thru-Hull

1-1/2" Flush Head Drain Thru-Hull

$34.50

1-1/2" FEMALE-1" BARB

1-1/2" FEMALE-1" BARB

$29.15

1-1/2" FEMALE-1-1/2" BARB

1-1/2" FEMALE-1-1/2" BARB

$31.80

1-1/2" FEMALE-1-1/8" BARB

1-1/2" FEMALE-1-1/8" BARB

$31.80

1-1/2" FEMALE-3/4" BARB

1-1/2" FEMALE-3/4" BARB

$23.90

1-1/2" Flush Head Full Threaded Thru-hull CF 250

1-1/2" Flush Head Full Threaded Thru-hull CF 250

From $37.15

1-1/2" Hose Tailpipe Mushroom Head Thru-Hull

1-1/2" Hose Tailpipe Mushroom Head Thru-Hull

$37.15

1-1/2" Mushroom Head Full Threaded Thru-Hull

1-1/2" Mushroom Head Full Threaded Thru-Hull

From $39.85

1-1/2" PTFE Ball Balve MF 850

1-1/2" PTFE Ball Balve MF 850

From $181.45

1-1/2" PTFE Ball Valve BSP MF 850

1-1/2" PTFE Ball Valve BSP MF 850

$181.45

1-1/2" PTFE Ball Valve MF 850

1-1/2" PTFE Ball Valve MF 850

$181.45

1-1/2" Screened Flush Head Drain Thru-Hull

1-1/2" Screened Flush Head Drain Thru-Hull

$47.85

1-1/2" Screened Flush Head Full Threaded Thru-hull CF 250

1-1/2" Screened Flush Head Full Threaded Thru-hull CF 250

$45.20

1-1/2" Screened Mushroom Head Full Threaded Thru-Hull

1-1/2" Screened Mushroom Head Full Threaded Thru-Hull

$45.20

1-1/4" Flush Head Drain Thru-Hull

1-1/4" Flush Head Drain Thru-Hull

$42.50

1-1/4" Flush Head Full Threaded Thru-hull CF 250

1-1/4" Flush Head Full Threaded Thru-hull CF 250

$34.50

1-1/4" Hose Tailpipe Mushroom Head Thru-Hull

1-1/4" Hose Tailpipe Mushroom Head Thru-Hull

$31.80

1-1/4" Mushroom Head Full Threaded Thru-Hull

1-1/4" Mushroom Head Full Threaded Thru-Hull

From $34.50

1-1/4" PTFE Ball Valve BSP MF 850

1-1/4" PTFE Ball Valve BSP MF 850

$144.05

1-1/4" PTFE Ball Valve MF 850

1-1/4" PTFE Ball Valve MF 850

From $144.05

1-1/4" Screened Flush Head Full Threaded Thru-hull CF 250

1-1/4" Screened Flush Head Full Threaded Thru-hull CF 250

$42.50

1-1/4" Screened Mushroom Head Full Threaded Thru-Hull

1-1/4" Screened Mushroom Head Full Threaded Thru-Hull

$34.50

1/2" PTFE Ball Valve MF 850

1/2" PTFE Ball Valve MF 850

$88.15

1/2" Flush Head Full Threaded Thru-hull CF 250

1/2" Flush Head Full Threaded Thru-hull CF 250

$29.15

1/2" Hose Tailpipe Screened Mushroom Head Thru-Hull

1/2" Hose Tailpipe Screened Mushroom Head Thru-Hull

$34.50

1/2" Mushroom Head Full Threaded Thru-Hull

1/2" Mushroom Head Full Threaded Thru-Hull

$25.40

1/2" Screened Flush Head Full Threaded Thru-hull CF 250

1/2" Screened Flush Head Full Threaded Thru-hull CF 250

$37.15

1/2" Screened Mushroom Head Full Threaded Thru-Hull

1/2" Screened Mushroom Head Full Threaded Thru-Hull

$34.50

17mm Drain Socket

17mm Drain Socket

$1.55

2" Flush Head Drain Thru-Hull

2" Flush Head Drain Thru-Hull

$71.90

2" Hose Tailpipe Mushroom Head Thru-Hull

2" Hose Tailpipe Mushroom Head Thru-Hull

$69.20

2" Mushroom Head Full Threaded Thru-Hull

2" Mushroom Head Full Threaded Thru-Hull

From $66.55

2" PTFE Ball Valve BSP MF 850

2" PTFE Ball Valve BSP MF 850

$251.15

2" PTFE Ball Valve MF 850

2" PTFE Ball Valve MF 850

From $251.15

2" Screened Flush Head Drain Thru-Hull

2" Screened Flush Head Drain Thru-Hull

$85.25

2" Screened Mushroom Head Full Threaded Thru-Hull

2" Screened Mushroom Head Full Threaded Thru-Hull

$79.90

22mm Drain Socket With Removable Screw Bung

22mm Drain Socket With Removable Screw Bung

$5.95

24mm Drain Socket and captive screw Bung

24mm Drain Socket and captive screw Bung

From $5.35

26mm Drain Socket With Captive Bung

26mm Drain Socket With Captive Bung

$4.80

3/4 Screened Mushroom Head Full Threaded Thru-Hull

3/4 Screened Mushroom Head Full Threaded Thru-Hull

$34.50

3/4" Hose Tailpipe Mushroom Head Thru-Hull

3/4" Hose Tailpipe Mushroom Head Thru-Hull

$29.15

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Related Content

Know Your Thread Forms

MARINE thru-hulls, tailpipes, valves and seacocks have parallel threads known as “American Standard Straight Mechanical” pipe threads or “NPSM”. These require thread compound or Teflon tape to seal.

Marelon® - Marine Grade Plumbing Systems

In the late 1970’s we (Forespar) undertook a search for a material that could replace the traditional bronze plumbing components used in boats.