PN21 Backing Flange Galvanised: 180mmBFG21180
ANSI Polypropylene Backing Flange: 180mmBFPA180
Table D Backing Flange Galvanised: 90mmBFGD/E090
ANSI Polypropylene Backing Flange: 355mmBFPA355
ANSI Polypropylene Backing Flange: 315mmBFPA315