Stainless steel gas PN16 flange adapters from M-Press are available here in sizes up to 108mm x 4”, they’re all made of stainless steel 316 (PressINOX) conforming to BS EN 10088-3. These adapters come with an M-profile press-fit end with an HNBR rubber O-ring/seal as well as a PN16 flanged end to BS EN 1029-1, they’re also DVGW G260 approved.
All stainless steel gas press fittings are designed for use on natural gas or LPG at up to 5 bar (PN5) pressure. The O-ring/seals with these fittings may be supplied loose for end-user installation, gas warning labels are also included and should be affixed to the outside of the fitting during installation.