... GB/T8464-20084. Pipe thread standard: ISO2285. Connection: Hot Welding.6. Size: 20mm, 25mm, 32mm, 40mm, ... .Advantage:1. Sanitary, non-toxic, no heavy metal additives, directly apply to the water supply system.2 ... pressure and temperature.Application:1. Residential cool/hot water piping system.2. Transport and discharge ... for other industries and agriculture. High quality double-head PPR ball valve