As per BS-3505 Equivalent to PS-3051/91 Size : 1/2" to 16" PVC Pipes Our pipes and fittings can be made according and conforming to the following International Standards:1) American standard (ASTM Sch 40 & Sch 80, SDR 21, SDR 26, SDR41)2) British standard (BS 3505, BS 5255, 4515)3) Singaporean standard (SS 141, SS 272, SS 213)4) Australian standard (AS 1477, AS 1415)5) Japanese standard (JIS K ...