Flanges are mostly used for the detachable connecting of plastic pipes. They can also be used for changing from plastic fittings to valve/pump devices.
Manufactured with outside diameters to BS10 table D&E
Note
See item 1 in the line drawing (full face flange). Dimensions apply to PVC-U and ABS. Backing rings should be used in conjunction with a full face flange. For pressure ratings over 2 bar, backing rings must be used.