(1) Where a group or block of dwellings is supplied from one connexon pipe, a stop-cock shall be fixed on each branch-pipe leading therefrom to each dwelling for the purpose of turning off the supply of water to such dwelling without interrupting the supply to the others.

(2) Where a tap is fixed to a stand-pipe from which water is intended to be supplied to more than one dwelling as aforesaid, such tap shall be of an approved self-closing type.