Purge ‘n’ weld bungs are designed to create a perfect seal during back purging and will improve your weld quality. The bungs are built from quality silicone to withstand high temperatures in close proximity to the weld. The kit contains 6 pairs or plugs, gas diffuser, purging tube and quick release fitting for instant purge line connection. 23mm – 26mm (1”) 32mm – 38mm (1.5”) 45mm – 52mm (2”) 55mm – 63mm (2.5”) 72mm – 76mm (3”) 84mm – 103mm (4”)