Plastic Trends Inc. has expanded its line of injection molded PVC SCH 40 DWV fittings, now ranging from 4 inches to 12 inches and including 4-inch and 6-inch backwater valves. PVC solvent-weld DWV fittings are third party tested and certified by NSF, CSA and IAPMO/UPC to meet the specifications defined by ASTM and CSA. Tested for impact, internal stress and dimensional stability, these fittings are engineered for strength and durability. Plastic Tends Inc.