Discover Our On/Off Valves & Keys Accessories Access your valve, when mounted on the inside of your Fire Pit and your enclosure is deeper than 4″, with one of our long valve keys. 1/4″ & 5/16″ Stepped key socket. These fire pit valve keys are Brass in color. They have a universal stepped end to fit both 1/4″ & 5/16″ valve stems.