Lot of 10 Service/Access Valve + Core & Cap/Core Remover 1/4" SAE x 5/16" OD x 2" stem 10 New Service/ Access Valves 1/4 SAE x 5/16 O.D. x 2" stem. Thickness 0.014" The core is a poppet valve assisted by a spring that is threaded into the steam Each valve has a core and a cap with valve core remover. The caps are made of metal, they are provided with core remover and have an inside rubber o-ring The stem is a self-contained valve which opens to admit gas to a chamber