Raritan Check Valve - 3/4"

The Raritan Check Valve - 3/4" (MPN 90845) is an essential plumbing component for any serious boater or marine system operator. After years on the water, experienced mariners know that preventing backflow in through-hull fittings and seawater systems can mean the difference between a clean bilge and a sinking emergency. This check valve serves as a one-way barrier, allowing fluid to flow in one direction while blocking reverse flow—critical when engine cooling systems, live wells, or sanitation systems sit idle or during boat transport.

Built by Raritan, a manufacturer trusted worldwide for marine toilets, waste treatment systems, and water handling equipment, this 3/4-inch check valve is engineered to withstand the corrosive salt-air environment and continuous exposure to seawater that destroys lesser components. The valve operates silently and requires zero maintenance once installed—no adjustments, no seasonal service calls. Its compact design (5 x 1 x 5 inches) and lightweight construction (0.1 lbs) make it easy to fit into tight engine rooms and confined bilge spaces where space is always at a premium.

This valve is ideal for installation in raw-water cooling loops, ballast systems, and any through-hull application where gravity or siphoning could cause unwanted backflow. Whether you're operating a pleasure cruiser, fishing boat, or commercial vessel, the 3/4-inch port size accommodates standard marine hose and fitting configurations. Proper installation—with flow direction clearly marked on the valve body—ensures years of silent, reliable protection without the headaches of preventable water damage or system contamination.