This is a vacuum relief and pressure sealing vent valve for marine plumbing systems. Using the valve eliminates the need to install individual vent piping to the atmosphere up through several decks. It means saving space, labor, and weight.
The valve is made of polyvinyl chloride (PVC) which is completely impervious to marine corrosion. It cannot discolor and needs no painting. The rubber seals are protected from damage by a perforated stainless steel screen. It is made with 3/4" IPS threads for simple attachment of a gooseneck vent line. The 3/4" size is adequate for any standard lavatory or water closet. Bronze available upon request.