JRA M6 High Flow Automotive Authentic Schrader Valve Cores -.  These valve cores are brand new, have a operating pressure of 800 psi max, operating temperature of -0 to 120F and are made  by Schrader International Inc. For use in automotive air conditioning 134A,ect. access ports. New and very high quality. Picture shows standard valve cores, but listing is for JRA M6 high flow automotive valve cores.