Use the 4-in-1 valve tool to remove valve cores, re-tap threads, and ream the inside of valves. Works on all standard Schrader valves.Use the 4-in-1 valve tool to remove valve cores, re-tap threads, and ream the inside of valves. Works on all standard Schrader valves.,Use the 4-in-1 valve tool to remove valve cores, re-tap threads, and ream the inside of valves.