Durable glass filled UV-resistant polypropylene construction inline valve. Buna N-valve seat seal. Manual external bleed. Stainless steel metering system including wire rod and spring. Wire rod design allows diaphragm expansion without affecting valve performance. Threaded bonnet allows for quick and easy serviceability. Double-beaded Santoprene diaphragm provides a leakproof seal. 1" threaded Female connection. Compatible with residential standard 24V sprinkler systems.