an insert sleeve 202 that is inserted into the tire on an interior surface typically the inner sidewall as shown in fig2 the insert sleeve 202 has an internal threaded bore 204 the insert sleeve 202 may be molded into the tire 12 or inserted post cure the insert is installed in the tire area so that the internal bore 204 is in fluid communication with the pump outlet end 44 a valve body 210 has an outer threaded surface 212 that is received within insert 202 the valve body 210 has a central passage 215 that has a first opening 218 that is in fluid communication with the insert sleeve bore 204 and the pump passageway 43 outlet end 44 when inserted into the tire the central passage 215 has an outlet end 217 that is in fluid communication with the tire cavity the valve body has a shaped head 222 such as a hexagonal shaped head bore 223 for receiving a mating tool such as an allen wrench useful for tightening the valve body 210 inside the sleeve 202 the central passage 215 further includes a retainer slot 230 for receiving flexible stopper 240 the flexible stopper 240 is preferably made of a resilient material such as rubber silicone or an elastomer the flexible stopper 240 has a disk shaped lower end 242 and two opposed legs 244 which extend from the lower end 242 each leg 244 has a shoe 250 which has a curved enlarged shape and is made of a resilient material as shown the shoe is a semi circle although other shapes would work for the invention although the flexible stopper 240 is.