Water-Supply-air-gaps class "A" & "B" as per the UK Bye lawsWater Supply bye-laws within the UK(UK) Water Bye-laws 22 & 23.Bye-law 22. 1. Every clothes washing machine, dishwasher or tumble dryer connected permanently or temporarily to the water supply service in any premises; shall incorporate either a Type "B" air gap or pipe interrupter which, if removed , renders the machine inoperable. 2. Subject to para 3, every machine of a kind mentioned in para 1 which is connected permanently or temporarily to the water service elsewhere other than a domestic dwelling shall draw water by gravity only from a storage cistern. 3. Par 2 shall not apply where any machine mentioned in that paragraph incorporates a Type "A" air gap. Bye-law 23 The inlet pipe of every Ion-exchange common salt regenerated type water softener used in connection with a clothes Washing machine or Dishwasher shall be fitted with a check valve and vacuum breaker or some other no less effective back flow prevention device; except where the supply of water to such a softener passes first through the back-flow prevention device incorporated with that washing machine or dishwasher in accordance with bye-law 22 (par 1) Water-Supply-air-gaps another page of useful information from the best laundry and dishwasher free information pages on the net. The diagram below shows the different class of air gap required by the byelaws.
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