Soil pipe is a minimum of 3" (82mm), normally we use 4" (110mm), think you are referring to Waste Pipe, 1.25" (32mm), 1.5" (40mm) or 2" (50mm) I think. Short answer is yes, all solvent weld waste, and all soil pipe and fittings are compatible across the manufacturers. The 'Push Fit' versions of Waste pipe/fittings are not.