1. The regulations (R15.21) state that "Where an outside tap is being installed in a new location, a double check valve (Type EC or ED) should be provided and fixed inside the envelope of the thermal insulation of a building".
2. The "where practicable" bit only applies to the replacement of an existing outside tap.
1. The regulations (R15.21) state that "Where an outside tap is being installed in a new location, a double check valve (Type EC or ED) should be provided and fixed inside the envelope of the thermal insulation of a building".
2. The "where practicable" bit only applies to the replacement of an existing outside tap.
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