Homespares Replacement Universal 1/2 Straight Bayonet Cooker Hose BS669 : Part 1 - Natural Gas Manufactured in the UK. 1/2 nominal size hose designed to be fitted to the 1/2 straight bayonet socket (B593) or angled bayonet socket (B553). Incorporates a patented Firesafe fusible plug which will shut off the gas supply at the socket in the event of a fire. For natural gas only. Must be installed in accordance with BS6172 UK National Installation Standard. Tested and approved by BSI to BS 669 Part 1 : 1989.