Operations Manual for the Issuance of Import Commodity Clearance (ICC) for Imported Unplasticized Polyvinyl Chloride Pipes covered by Philippine National Standard (PNS) 1950:2003 with Corrigendum 1:2004, Plastic piping system for soil and water discharge (Low and High Temperature) inside buildings - Unplasticized polyvinyl chloride (PVC-U)