Wastepipe We stock the following sizes of waste and overflow pipe: Polypipe Wastepipe 32 mm (1 1/4″) x 3 m 43 mm (1 1/2″) x 3 m 51 mm (2″) x 3 m Polypipe Overflow 21.5 mm x 3 m Fittings Available Solvent weld fittings