The poly steel fittings are made of malleable cast iron fittings and lined with propylene ( PP) via injection machine with outside epoxy coating, used to connect with poly steel pipe by thread. The working pressure is up to 1.6Mpa and size available is from 1/ 2" ( 15mm) to 4" ( 100mm) . Specification: BS EN 10241: 2000, BS EN10226-1: 2004, BS EN10242, BS143& 1256 JWWA K116: 1987, JPF MP003-2003, JPF MP005-2004, CJ/ T137-2008