Forespar Vented Loop Marine Anti-Siphon Valve

The Forespar Vented Loop Marine Anti-Siphon Valve (also called a vented loop or anti-siphon loop) stops fluid from siphoning from tank to tank or back into a engine or fixture. It is commonly installed in marine toilet (head) systems and engine cooling water lines.

Key Features:

• Simple vent valve: The valve in the top of the loop lets air into the line when it is not in use. It seals as water or other fluid passes through.
• Corrosion-proof Marelon construction: Neither the loop nor the vent will corrode, because both are molded in Marelon glass-reinforced composite.
• Duckbill one-way valve: The valve is designed to seal properly even when particulate is present in the fluid.
• Optional outside-hull venting: The MF-846 vent barb assembly can be used in place of the standard MF-841 cap and duckbill. It vents to the outside of the hull through a 1/4 inch (6.35 mm) hose.
• Versatile uses: Install it above the waterline on head discharge lines, bilge pumps, engines, generator sets, air conditioners, ballast tanks and other equipment.

Forespar vented loops help reduce the risk of back-siphoning and flooding when pumps are off. They are a dependable addition to any boat's plumbing or cooling system.