Forespar’s MF 850 series of Ball Valves are precision molded in high strength Marelon®. Their great strength, light weight, and complete freedom from corrosion and electrolysis make them the ideal valve for controlling inlet and outlet water requirements above and below the waterline.
Forespar's engineers opened and closed one of the 3/4”(19.05mm) valves 11,000 times, then submerged it in water with an air line pressurized to 40 p.s.i. connected to it. The result was an absolutely leak free condition with no evidence of internal seal wear. Valves sold throughout the U.S.A. have parallel marine type threads. B.S.P. thread are available.
All Forespar valves are non-corrosive, but like any moving part in a marine environment, they require regular inspection and lubrication. Regularly actuate the handle and lubricate the seals. For proper and easy valve lubrication, Forespar recommends the MareLube Reach valve lubrication kit. It allows you to inject the correct lubrication directly onto the valve’s moving parts using a pre-loaded syringe and extension tube.
Zero corrosion, zero electrolysis, light weight, strong marine grade
The temperature range of Marelon is: -40F to +176F or -40C to +80C
Marelon® is a non-corrosive proprietary formulation of Polymer composite compounds using resins and additives to produce a superior marine grade product
- For use above and below waterline
- Precision moulded plumbing systems
- Complete freedom from corrosion
- Complete freedom from electrolysis or reaction to any metals
- The temperature range of Marelon® is -40°C to +80°C
- Can be used on aluminium, steel, wood or FRP hull forms
- Compatible with traditional bronze fittings
- U.L. approved & ISO certified
- A.B.Y.C. Compliant
Visit our Catalogues section for Installation Instructions, Maintenance Tips, Certifications and more.
Forespar® accepts no responsibility for valve or thru-hull components which are improperly installed, tampered with or have inadequate access for service and maintenance.
Thread size: 2" (50.08mm)
Body diameter: 4-1/4" (107.95mm)
Body length: 5-7/8" (149.22mm)
Length with handle: 8" (203.2mm)