Gas welding and cutting equipment must be checked regularly. The British Compressed Gases Association, Code of Practice 7 (CP7 -The Safe Use of Oxy-Fuel Gas Equipment) and Guidance Note 7 (GN7 - The Safe Use of Individual Portable or Mobile Cylinder Gas Supply Equipment) recommend that regulators and flashback arrestors are checked annually and replaced every five years. This is a safety check kit to be used by an able, recomended body.