TaijiBlue^® PVC-O pipes seal ring and fittings are made according to China standards.

Seal rings standard: GB/T 21873-2008 Rubber seals—Joint rings for water supply, drainage and sewerage pipelines—Specification for materials
 

Injection moulding fittings standard: GB/T 10002.2-2003 Unplasticized poly (vinyl chloride)(PVC-U) fittings for water supply
 

Ductile iron fittings standard: GB/T 13295-2013 Ductile iron pipes, fittings and accessories for water or gas applications.