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'All new drains and sewers laid in the UK must be subjected to an air pressure test in accordance with BS 8005. A full range of test equipment for this purpose including the latest technology in super nylon. Tests should be carried out before back filling or placing bedding or surrounding concrete. Tests should be made manhole to manhole. The tests should be carried out by inserting drain plugs at each end of the pipe and assembling the ''U'' Air Kit as illustrated. Air is pumped in by hand bellows until the pressure of 100mm is indicated on the gauge. Provided the air pressure does not fall below 75mm in a 5 minute period, the drain is deemed to have passed the test.'
