MASTERCOOL 91337 R-12/R-134a Valve Core Repair Kit Includes 20 pieces of access valve cores and 10 pieces of valve cores Includes 10 pieces of R134a JRA High/Low import valve cores Includes 5 pieces of R134a Domestic high flow valve cores M10 Includes 5 pieces R134a Domestic high flow valve cores M8 Includes 1 R12/R134a valve core remover/installer