Matco-Norca has upgraded its lead-free brass 759 press ball valve (759PLF) to feature leak-prior-to-press technology. This design incorporates a special EPDM O-ring that allows water or air past the sealing element of an un-pressed connection. The press fit feature is built into the design of the ball valve’s O-ring and provides a pass for liquids from inside the pipe to weep past the sealing O-ring of an un-pressed connection. Manufactured in ISO 9002-approved factories and available in sizes 1/2" up to 4", Matco-Norca’s upgraded 759PLF ball valves come with one O-ring and are compliant with UPC, AB1953, NSF-61 and NSF-372 standards. Matco-Norca.