MARELON is an extremely strong, marine-grade, polymer composite for long term use in all applications.
Create Customised Valves Manufactured To Fit Your Exact OEM Specs
• For Use Above or Below Waterline
• Exclusive Polymer Formulation That Will Never Corrode
• Can be Used with Any Hull Material
• Requires No Bonding Wires
• Immune to Lightning Strike Damage
• Saves Weight for Better Speed & Efficiency
MARELON products are ABYC compliant and can be used above and below the waterline.
Over 2400 different MARELON valve configurations are available, as well as thru-hulls, fittings, vented loops, water strainers, and other commonly used plumbing parts.
How To Spec Your Custom Pro Series™ Valve Part Number
Just select your desired Base, Body & Top style. Then enter the corresponding style number into the appropriate column of the product number sequence as shown in the examples.
Forespar’s popular Marelon® Pro Series™ valves are available in many custom configurations made to fit your exact specifications. Use this guide to determine the correct top, body and base components needed to fit your needs.
Select Valve Components for Your Custom Valve Using the Number Codes
Just select your desired Base, Body & Top style from the choices available. Then enter the corresponding style number into the appropriate column of the product number sequence table.
Base Options: The third digit in the six digit sequence indicates the base, or bottom of the valve.
1 Flanged, seacock base with mushroom head buttress threaded thru-hull
2 Flanged, seacock base with a flush head buttress threaded thru-hull
3 Female NPSM threaded base
4 Straight barbed tailpipe
5 90 degree elbow barbed tailpipe
6 Flanged, seacock base with screened flush head buttress threaded thru-hull
7 Flanged, seacock base with screened mushroom head buttress threaded thru-hull
8 Black thru-hull (standard is white)
9 NEW - Extra long thru-hull (5-3/4” long)
Body Options: The fourth digit in the six digit sequence indicates the body, or middle section of the valve.
1 Straight flow, single port with a thru-hull plug for use with our buttress thru-hulls
2 Double port, Y-valve with body barb opposite the handle with a thru-hull plug
3 Straight flow, single port with no thru-hull plug; only a flush cap on the handle
4 Double port, Y-valve with body barb opposite the handle with a flush cap on the handle
5 Double port “Dual Drain” with the body barb opposite the handle and a thru-hull plug
6 Double port “Dual Drain” with the body barb opposite the handle and flush cap handle
Top Options: The fifth digit in the six digit sequence indicates the top section of the valve.
3 Female Threads
4 Straight Hose Barb Tailpipe
5 Low Profile 90 degree elbow hose barb.
6 Blank top only (used on very few configurations-with body 5 & 6 only)
7 NOT SHOWN - Female garden hose fitting (used only on engine flush-out valves-body #2 & 4)
Valve Size Options: The sixt digit indicates the valve size
| Valve Size | 1/2" | 3/4" | 1" | 1 1/8" | 1 1/4" | 1 1/2" | 2" |
| Code | 2 | 3 | 4 | 0-4 | 5 | 6 | 8 |
The Difference Between Y-Valves and Dual Drain Valves
Y-Valve - Y-valves have 3 modes: Off, A-B connected, and B-C connected. They can be used to divert water between a head system, a holding tank, and fresh water or to send raw water from a single input to two separate outputs.
Dual Drain - Dual Drain valves have 2 modes: A-B-C connected, and off. They can be used to provide raw water to multiple systems, or discharge multiple systems with a single drain.
Optional Valve Modifiers Codes: Special valve modifications indicated at the end of the part number:
N - Specifies an NPSM straight threaded base for seacock valves, allowing the valve to be installed on a standard thru hull.
No thru hull or handle plug will be included on a valve with this option.
B - Specifies a BSP threaded base. (1” – 2”) No thru-hull or handle plug is provided.
C - Specifies a chromed mushroom head buttress thread thru-hull.
L - The top elbow needs to face left. (From the point of view looking at the top of the valve, with the handle facing 'down'.
R - The top elbow needs to face right.
E - Specifies the valve is to be used with an ROV electric motor. (OEM only)
V - Specifies an anti-venturi style thru hull to be paired with the valve. Does not include thru-hull plug.
K - Specifies a handle lock-off plate to satisfy USCG requirements, usable with standard padlocks. (Only available on 1" & 2" sizes)
Z - Specifies a Large Speed Scoop. (Only available on 1-1/2” & 2” valve sizes)
Choosing what you require can be complicated due to the many options available. Forespar have some great Catalogues and Tech sheets to help make the process easier.
