... standard: GB/T8464-20084. Pipe thread standard: ISO2285. Connection: Hot Welding.6. Size: 20mm, 25mm, 32mm, 40mm, 50mm, 63mm,75mm7. ... scaling, no rust, anti-bacterial.3. Light weight, high strength and high impact strength.4. Convenient installation, reliable, recycled, environmental protection ... equipment.7. Piping system for other industries and agriculture. High quality double-head PPR ball valve