TCVN 6245-1997 Unplasticized polyvinyl chloride (PVC) infection moulded solvent welded socket fittings for use with pressure pipe.Hydraulic internal pressure test
2008TCVN 6245-1997 Unplasticized polyvinyl chloride (PVC) infection moulded solvent welded socket fittings for use with pressure pipe.Hydraulic internal pressure test