A.Y. McDonald 5141-157 1-1/4" AYM 74758-22 CTS COMP COUP LF

Yes, the 5141-157 is a 1-1/4 inch CTS compression coupling. CTS sizing means it is built to the outside diameter of 1-1/4 inch copper tube size pipe, which is what PE and other service tubing sold as CTS is made to. Pipe sold in iron pipe size (IPS) has a different OD at the same nominal call-out and will not seat correctly in a CTS fitting, so confirm the tubing stamped on your service line reads CTS before you cut it in.

A coupling joins two lengths of pipe in a straight run, so the 5141-157 is what you use to splice a cut or damaged section of 1-1/4 inch CTS service line back together, or to extend a run. Both ends are the same compression connection, so there is no thread to cut and no soldering. If you need to change direction, change size, or terminate into a valve or meter, a coupling is the wrong body style and you want the corresponding elbow, adapter, or curb stop instead.

Order it as A.Y. McDonald 5141-157. The manufacturer also carries it under the factory number 74758-22, so either designation gets you the same 1-1/4 inch CTS lead free compression coupling. Distributors cross-referencing older paperwork will often see the 74758-22 number.

Compression couplings in this A.Y. McDonald waterworks line are made for underground service work, which is where a 1-1/4 inch CTS lead free coupling normally goes in. The joint is mechanical, so it is made up with a wrench in the trench rather than needing heat. Follow your local utility's bedding and backfill requirements for the service line itself.