... 3.PPR:Yanshan Petro,Korea Hyosung 4.Thread standard:ISO 5.Thread type:G,R, NPT, BSP Ppr ... is from Hyosung of Korea.2. Thread standard: GB, BS, JIS and so on.3. Thread type: G, R, BSP, NPT2 ... . Pressure Grade: 2.5MPa.AN3. Design standard: GB/T8464-20084. Pipe thread ... Piping system for other industries and agriculture. High quality male thread PPR ball valve