Plastic Universal Valve Core Tool Part#: 5090 It is very effective for home, auto and bicycle use. This tool works for most A/C refrigerant valve cores: One end is for R12, R22, R410A, R502, R404 and R407 valve cores (1/4" - 20 flare) (small end) The other end is for R134 valve cores only (large end). Can also be used on bike tires! A great tool for a great price! CAUTION: A/C system must be evacuated of all refrigerant before removing or replacing Schrader valves! .
