The Plumb Pak quarter turn straight shut-off valve is tagged as lead-free, making it safe to use with potable water systems. It comes with a chrome plated finish that doesn't wear off easily. This straight stop valve features a 5/8 in. OD.nominal copper connection by a 3/8 in. OD connection.• These valves push-on to PEX, CPVC or copper, double o-ring seal, safety clip• Top quality solid brass stem with double o-ring seal• It is ideal for use for tight spots, a shorter stub out, finished wall or floor• •