UMAREX COMMANDER ,TANFOGLIO ,SWISS ARMS ,CYBERGUN,SRC AIRSOFT PLUS MANY OTHERS THAT USE A PUSH FIT SEAL  FOR THE CO2 BULB,LIKE THE ONE PICTURED..FISH THE OLD SEAL OUT WITH A TOOTHPICK ,REPLACE WITH THESE,TO ENSURE SEAL IS SITTING FLAT ,PUT OLD CO2 BULB IN AND SCREW DOWN ,TO MAKE SURE SEAL IS FLAT..

                                               LISTING IS FOR TWO SEALS... 


                                   ALL SEALS MADE IN UK WITH TOP QUALITY POLYURETHANE!