UPVC Plumbing Pipes & Fittings These are available from +÷(15mm) to 4÷(110mm) sizes, in schedules 40, 80 & 120 as per ASTM-D-1785. The fittings for above sizes of pipes include Couplers, Elbows, Tees, Unions, Adaptors, Reducers, etc. and are available in 16kg/cm2 pressure rating. The threading of pipes & fittings are as per IS:554/BS:21. These pipes and fittings are used as substitutes / replacement for G.I. Pipes & Fittings for applications in water supply lines in buildings, industries, etc.