(1) No single-or double-tee or tapped-tee branch or any fitting or connexion which offers abnormal obstruction to flow through a sewer-pipe, waste-pipe or soil-pipe shall be used.

(2) The drilling and tapping of any pipe used in the sewerage system after its installation is prohibited.

(3) Dead ends in waste-pipes or soil-pipes shall not be permitted except where necessary to extend the pipe for cleaning purposes, and all such dead ends sall be accessible.

(4) No opposite junction shall be used in any sewerage system if the included angle between the two entering pipes will exceed pipes will exceed 90 degrees.

(5) Loose sockets shall be used only where no other form of construction is practicable, and then only with the approval of the local authority.