Forespar MF-841 Replacement Duck Bill/Cap Assembly

Features:

• This simple valve system when incorporated in the top of a vented loop allows air to enter the line when it is not in use
• Then it effectively seals as water or other fluid passes through
• Molded in Marelon®, vent will not corrode
• The duckbill one way valve is designed to seal properly if particulate matter is present in fluids

Note: Forespar threaded plumbing fittings, like most true marine plumbing fittings, use NPSM threads (National Standard Free-Fitting Straight Mechanical Pipe Thread). NPT (National Pipe Threads) are tapered, NPSM Threads are parallel. The two types are not designed to work together.