Pipe Outside Diameter Compatibility Pipe Size Charts: pressure & non-pressure pipes Flange Tables UPVC Head Loss Calc Tables - Aqua Seal Note: these tables will take a few minutes to download AS1477 Series 1 Class 4.5/Class 6/Class 9 AS1477 Series 1 Class 12/Class 15/Class 18 UPVC Head Loss Calc Tables - Plas Iron Note: these tables will take a few minutes to download AS1477 Series 1 Class 6/Class 9/Class 12 AS1477 Series 1 Class 16/Class 18/Class 20