Div. B › Part 7 › 7.3 › 7.3.3 — Joints and Connections

7.3.3.4 — Unions and Slip Joints

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(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.

OBC Definitions

Defined terms on this page

accessible

means , when applied to a fixture, connection, plumbing appliance, valve, cleanout or equipment, to be accessible with or without having to first remove an access panel, door or similar obstruction, but a fixture, connection, plumbing appliance, valve, cleanout or equipment is not accessible if access can be gained only by cutting or breaking materials.

drainage system

means an assembly of pipes, fittings, fixtures and appurtenances on a property that is used to convey sewage and clear water waste to a main sewer or a private sewage disposal system, and includes a private sewer, but does not include subsoil drainage piping. Drinking water system has the same meaning as in subsection 2 (1) of the Safe Drinking Water Act, 2002.

fixture

means a receptacle, plumbing appliance, apparatus or other device that discharges sewage or clear water waste, and includes a floor drain.

fixture drain

means the pipe that connects a trap serving a fixture to another part of a drainage system.

trap

means a fitting or device that is designed to hold a liquid seal that will prevent the passage of gas but will not materially affect the flow of a liquid.

trap weir

means the highest part of the lower interior surface of a trap.

venting system

means an assembly of pipes and fittings that connects a drainage system with open air for circulation of air and the protection of trap seals in the drainage system.

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