CSA B602-2026

Mechanical couplings for drain, waste, and vent pipe and sewer pipe

Preface This is the eighth edition of CSA B602, Mechanical couplings for drain, waste, and vent pipe and sewer pipe . It supersedes the previous editions published in 2020, 2016, 2010, 2005, 1999, 1990, and 1988. The following are the major changes to this edition: a) the addition of Type 5 couplings; b) joint tightness test performance and procedures for Type 5 couplings; c) addition of deflection angles for Type 5 couplings in Table 2; d) addition of test pressure values for Type 5 couplings in Table 3; e) addition of Table 4for thrust end restraint for Type 5 couplings; f) addition of a new Figure 2for the testing of Type 5 couplings; and g) revisions to Clauses A.2and A.3. This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard. This Standard was prepared by the Technical Committee on Mechanical Couplings for DWV and Sewer Pipe, under the jurisdiction of the Strategic Steering Committee on Construction and Civil Infrastructure, and has been formally approved by the Technical Committee. This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group. Scope 1.1 General This Standard covers mechanical couplings that are used to axially join pipes and fittings in non-pressure drain, waste, and vent (DWV) piping systems and sewer piping systems located inside or outside buildings and above ground or underground. Notes: 1) Caution should be exercised when installing mechanical couplings at low temperatures. The coupling manufacturer should be consulted. 2) Caution should also be exercised when installing mechanical couplings at the base of stacks, at cleanouts, or at offsets in a piping system (see Annex A). 1.2 Types of couplings This Standard specifies requirements for the following types of mechanical couplings: a) Type 1 — couplings that are used to join pipes of the same or different materials or sizes, and that incorporate a centre stop and an external shield; b) Type 2 — couplings that are used to join pipes of the same or different materials or sizes for which a centre stop or shear ring is not required but can be incorporated; c) Type 3 — couplings used to join hubless cast iron pipe and fittings. Such couplings are composed of a stainless steel shield, a clamp assembly, and an elastomeric sealing component that complies with ASTM C564; d) Type 4 — elastomeric bellows expansion joint couplings used to join pipe of the same or different materials or sizes incorporating pipe stops; and e) Type 5 — couplings used to join hubless cast iron pipe and fittings. Such couplings have an integral restraint feature that enables the couplings to be used as an alternative to external joint restraint at changes of direction and locations subject to extended periods of maximum flow. Note: Type 5 couplings are intended for non-continuous pressure at 75 psi or less for DWV or rainwater systems. Notes: 1) Pipe and pipe-fitting materials that may be joined include a) fibrocement (see CSA B127.3); b) cast iron (see CSA B70); c) concrete (see CSA A257 Series and ASTM C14); d) copper (see ASTM B306); e) acrylonitrile-butadiene-styrene (ABS) (see CSA B181.1, CSA B182.1, ASTM D2661, and ASTM F628); f) polyvinylchloride (PVC) (see CSA B181.2, CSA B182.1, CSA B182.2, ASTM D2665, and ASTM F891); g) galvanized steel (see ASTM A53/A53M); and h) vitrified clay (see ASTM C700). 2) Type 5 couplings are an alternative to bracing as indicated in Annex A. 3) Users should note the existence of other standards developed for different types of couplings or coupling materials, e.g., ASTM A1128, ASTM C1173, ASTM C1277, ASTM C1440, ASTM C1460, ASTM C1461, ASTM C1540, and ASTM D5926. 1.3 Exclusions This Standard does not cover the joining of pipes and fittings with bell and spigot ends that use an elastomeric gasket seal. 1.4 Terminology In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the Standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application. 1.5 Units of measurement The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.