Robinair's No. 40302 Air Conditioning Line Piercing Valve with Valve Core allows the addition of schrader valve protected access to A/C and refrigerant lines. Designed for use on 3/16, 1/4, 5/16, and 3/8 inch OD tubing. 1/4 inch male flare outlet. Jaws grip firmly for a strong pierce and leak-proof seal. Robinair, a Bosch Automotive Service Solutions brand, is a global leader in service tools and equipment based in Owatonna, Minnesota. Robinair is recognized throughout the world as the quality and performance leader in AC/R evacuation tools and this position has led to its success with the full range of products that serve the heating/ventilating/air conditioning/refrigeration (HVAC-R) and mobile markets.