50MM RIGID WASTE SYSTEM PIPE Pipe sold per mtr. Max length for carrier despatch 1.5mtr. Maximum Single length 5mtr (Collection only) The 50mm Waste water drain piping system allows the repair or modification of existing slide valves and drain taps remotely installed away from the tank. Pipe and fittings can be assembled easily using normal solvent pipe cement. 50mm is outside diameter of the ridgid pipe.