... :CuZn39Pb3, etc. 2.Cu%:57%-60% 3.Thread standard:ISO,DIN,BS,GB 4.Thread specification:G,R,NPT 5.Nickel plated ... . Pressure Grade: 1.6MPa3. Design standard: GB/T8464-20084. Pipe thread standard: ISO228 or according to requirement5. Connection: Hot Welding.6 ... .7. Piping system for other industries and agriculture. High quality female thread PPR ball valves