Forespar Marelon MF 850 Ball Valves

$43.41 to $169.95
$43.41 to $169.95
  • Forespar's MF 850 series of Ball Valves are precision molded in high strength glass-reinforced Marelon.
  • Size = Thread Size
  • Strong, light weight, and corrosion free
  • Ideal for above and below the waterline applications
  • All valves sold throughout the U.S.A. have NPT threads
  • Unless otherwise specified, B.S.P. come on valves sold outside of America
  • P.T.F.E. seals are supplied as standard on 1/2", 3/4", 1", 1-1/4", 1-1/2" and 2" valves
  • The temperature range of Marelon. is: -40 Deg. F to +176 Deg. F or -40 Deg. C to +80 Deg. C
Our engineers opened and closed one of our 3/4" 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 wear on internal seals.

Valve Maintenance All our valves are non-corrosive, but like any moving parts in a marine environment, they require regular inspection and lubrication. Do not fail to actuate the handle and lubricate the seals on a regular schedule (water pump grease or even vegetable oil will lubricate seals).

Item #
Thread Size
Body Diameter
Body Length
Length w/Handle
Forespar Marelon MF 850 Ball Valve, 2"
Item #:531580-2"
Model: MF850 2"
Thread Size: 2"
Body Diameter: 4-1/4"
Body Length: 5-7/8"
Length w/Handle: 8"
Forespar Marelon MF 850 Ball Valve, 1"
Item #:531580-1"
Model: MF 850 1"
Thread Size: 1"
Body Diameter: 2-3/4"
Body Length: 4-3/4"
Length w/Handle: 5-1/2"
Forespar Marelon MF 850 Ball Valve, 1-1/4"
Item #:531580-1-1/4"
Model: MF 850 1-1/4"
Thread Size: 1-1/4"
Body Diameter: 2-3/4"
Body Length: 4-7/8"
Length w/Handle: 5-3/4"
Forespar Marelon MF 850 Ball Valve, 1/2"
Item #:531580-1/2"
Model: MF 850 1/2"
Thread Size: 1/2"
Body Diameter:
Body Length:
Length w/Handle:
Forespar Marelon MF 850 Ball Valve, 1-1/2"
Item #:531580-1-1/2"
Model: MF 850 1-1/2"
Thread Size: 1-1/2"
Body Diameter: 3-1/2"
Body Length: 5"
Length w/Handle: 7-1/2"
Forespar Marelon MF 850 Ball Valve, 3/4"
Item #:531580-3/4"
Model: MF 850 3/4"
Thread Size: 3/4"
Body Diameter: 1-7/8"
Body Length: 3"
Length w/Handle: 4"

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Forespar Products Corp. warrants all products manufactured by it to be free from factory defects in material and workmanship under normal use and with normal maintenance for a period of thirty six 36 months from the date of initial retail sale. The Limited Warranty is extended only to the original retail purchaser and does not run to any subsequent purchaser. Proof of purchase is required.


  • All returns must be recevied within 30 days of receipt of the order.
  • Manufacturer defects reported within 30 days of receipt will be supplied a pre-paid label for return shipping upon approval.
  • Please contact Go2marine LFS Marine and Outdoor for Manufacture Defects, Returns and help with Warranties.