7.3.3.

(1) Except as provided in Sentences (2) to (4), no water distributing pipe, drainage pipe or fittings shall be drilled, tapped or swaged.

(2) A water distributing pipe may be drilled or tapped to provide for a mechanically extracted T in copper tubing of Type L or K provided that all branch connections shall be notched and dimpled to limit depth of insertion and conform to the inner contour of the main.

(3) A copper water distributing pipe of 1 in. size or larger may be mechanically swaged to permit the joining of other copper pipe of equal size.

(4) A drainage pipe or fitting may be drilled or tapped,

(a) to provide for the connection of a trap seal primer line,

(b) to connect a device designed to dispense germicidal or odour control chemicals or trap seal water to a floor drain downstream of a vacuum breaker or flush valve in a flush tube connected to a sanitary unit,

(c) to provide a hole for a branch connection to a drainage pipe, where the branch connection is made with a saddle hub as permitted by Article 7.2.10.5. and where the hole is drilled to provide a smooth clean hole of the required size and orientation, or

(d) to provide for the connection of pipe or fittings to metal or rigid plastic pipe and fittings where the pipe or fittings are thick enough to be threaded or are bossed for tapping.

(5) No pipe adaption shall be made by the use of a bushing that leaves a square edge or shoulder on the inside of the pipe or fitting.

(1) Cast iron soil pipe and fittings shall not be welded.

(2) Galvanized steel pipe and fittings shall not be welded.

(1) Running thread and packing nut connections and unions with a gasket seal shall not be used downstream of a trap weir in a drainage system or in a venting system.

(2) A slip joint shall not be used,

(a) in a venting system, or

(b) in a drainage system, except to connect a fixture trap to a fixture drain in an accessible location.

(1) Every connection between two pipes of different size shall be made with an increaser or a reducer fitting installed so that it will permit the system to be completely drained.

(1) Adapters, connectors or mechanical joints used to join dissimilar materials shall be designed to accommodate the required transition.

(1) Every roof drain shall be securely connected to a leader and provision shall be made for expansion.

(1) Every pedestal urinal, floor-mounted water closet or S-trap standard shall be connected to a fixture drain by a floor flange, except that a cast iron trap standard may be caulked to a cast iron pipe.

(2) Except as provided in Sentence (3), every floor flange shall be of brass.

(3) Where cast iron or plastic pipe is used, a floor flange of the same material may be used.

(4) Every floor flange shall be securely set on a firm base and bolted to the trap flange of the fixture, and every joint shall be sealed with a natural rubber, synthetic rubber gasket, or with a closet setting compound.

(5) Where a lead water closet stub is used, the length of the stub below the floor flange shall be at least 75 mm.

(1) The design and installation of every piping system shall, where necessary, include means to accommodate expansion and contraction of the piping system caused by temperature change or building shrinkage.

(1) Types M and DWV copper tube shall not be bent.

(2) Bends in copper tubing of soft or bending temper shall be made with tools manufactured and sized for the purpose.

(1) Where a fixture or device is indirectly connected, the connections shall be made by terminating the fixture drain above the flood level rim of a directly connected fixture to form an air break.

(2) The size of the air break shall be at least 25 mm.