No person shall install any installation pipework in which deposition of liquid or solid matter is likely to occur unless a suitable vessel for the reception of any deposit which may form is fixed to the pipe in a conspicuous and readily accessible position and safe means are provided for the removal of the deposit.
Regulation 21: Clogging precautions
The Gas Safety (Installation and Use) Regulations 1998 · S.I. 1998/2451View on legislation.gov.uk
Part D: INSTALLATION PIPEWORK
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