Easy action PTFE plug with hooded handle, threaded into heavy wall glass barrel, permits smooth adjustment. Arm is at 90 degree angle. Double PTFE ring seal prevents exposure of FETFE backup O-Ring to corrosive gases and liquids. Plug, with hooded handle removed, is bake able. For barrels, see 8195-32 or -34. For replacement plugs, see 8192-263 or -264, below. For O-Rings, see 8194-303 or -304.