A.Y. McDonald 74779M-22-1X3/4 ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$45.34
A.Y. McDonald 74779M-22-1X3/4 CTS Reducing Compression Coupling, 1" x 3/4"

A.Y. McDonald 74779M-22-1X3/4 CTS Reducing Compression Coupling, 1" x 3/4"

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Model: 74779M-22-1X3/4

In Stock (leaves warehouse same day if ordered before 3pm ET)

$45.34
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A.Y. McDonald 74779M-22-1X3/4 CTS Reducing Compression Coupling, 1" x 3/4"

The A.Y. McDonald 74779M-22-1X3/4 is a reducing compression coupling sized 1" x 3/4", designed for joining water service tubing of two different CTS (copper tube size) diameters in an underground or behind-the-wall rough-in application. Identified by A.Y. McDonald's internal reference 5142-000 and model number 74779M-22, this coupling is built for plumbers and utility contractors connecting or transitioning water service lines during new installation or repair work. Its compression-style connection allows for a reliable, gasketed joint on each end without the need for soldering or solvent welding, making it a practical choice for field installations where a quick, mechanical connection is preferred.

Key Features

  • Trade Size: 1" x 3/4" reducing configuration, allowing transition between two different CTS pipe or tubing diameters in a single fitting.
  • Compression Connection: Each end of the coupling uses a compression-style joint, allowing installation without soldering, threading, or solvent welding — well suited for underground water service and rough-in connections.
  • Reducing Design: Purpose-built to step down from a 1" line to a 3/4" line (or vice versa), simplifying transitions in water service runs without requiring multiple fittings.
  • Model Reference: Cataloged by A.Y. McDonald under model number 74779M-22 and internal reference 5142-000 for accurate cross-reference and reordering.
  • Rough-In Application: Intended for use behind the wall, underground, or in other concealed water service and distribution runs rather than exposed decorative plumbing.

Technical Specifications

  • Model Number: 74779M-22
  • Internal Reference: 5142-000
  • Trade Size: 1" x 3/4"
  • Connection Type: Compression x Compression
  • Refer to manufacturer documentation for complete additional specifications not listed above.

Typical Applications

  • Underground Water Service Line Connections
  • Rough-In Plumbing for New Construction
  • Water Service Line Repair and Replacement
  • Transitioning Between Differing CTS Pipe Diameters
  • Utility and Contractor Water Distribution Work

Why A.Y. McDonald?

A.Y. McDonald has long supplied water service and distribution fittings relied on by plumbing contractors and utility installers for dependable, code-driven rough-in work. The 74779M-22-1X3/4 reducing compression coupling reflects that focus, offering a straightforward mechanical connection for tying together differing water service line sizes in the field. Choosing A.Y. McDonald components for water service transitions helps keep installations consistent and traceable back to a single, purpose-built manufacturer reference.

Manufacturer Resources

Product Specs

list_batch:
AYM-20260924
Product Type:
Compression Coupling
Connection Type:
Compression
Department:
Plumbing
Product Group:
Plumbing
Product Subgroup:
Plumbing
Product Size:
1" x 3/4"

A.Y. McDonald 74779M-22-1X3/4 – Frequently Asked Questions

1) What does the A.Y. McDonald 74779M-22 coupling connect, and does it need soldering?
It's a reducing compression coupling that joins 1 inch CTS water service tubing to 3/4 inch CTS. Both ends are compression, so the joint is made mechanically with a gasketed nut and ring, no torch, no threading, no solvent cement. That's why it gets used on wet repairs and in trenches where you can't get a pipe dry enough to solder.
2) Is the 74779M-22 sized for CTS tubing or for IPS pipe?
CTS, copper tube size. The 1 inch and 3/4 inch ends are both CTS, so if your water service is IPS-dimensioned plastic or steel, the gaskets won't seal on it and you need an IPS-sized coupling instead. Confirm what the existing line actually measures before you order this one.
3) Can I use one 74779M-22 instead of a coupling plus a reducer bushing on a water service run?
Yes. The reduction is built into the single fitting, stepping a 1 inch line down to 3/4 inch (or up, depending which way you run it), so you make two joints instead of three or four. Fewer joints in a buried service line means fewer places to leak.
4) Is this coupling OK to bury underground or does it have to stay accessible?
A.Y. McDonald lists the 74779M-22 for underground water service and behind-the-wall rough-in, so it's a concealed-run fitting rather than an exposed decorative one. Typical uses are new-construction service laterals, service line repair and replacement, and tying two different CTS diameters together in a distribution run.
5) What part number do I give my supplier to reorder this A.Y. McDonald reducing coupling?
Order it as A.Y. McDonald model 74779M-22, size 1 inch x 3/4 inch, full designation 74779M-22-1X3/4. A.Y. McDonald also carries it under the internal reference 5142-000 if a counter is cross-checking their own system.
6) Which size goes on which side of the 74779M-22, and does direction of flow matter?
One end takes 1 inch CTS tubing, the other takes 3/4 inch, and the fitting is a straight mechanical coupling, so there's no upstream or downstream requirement. Orient it whichever way the run needs, just make sure each tube goes into the matching end.
How fast can I get the A.Y. McDonald 74779M-22-1X3/4 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the A.Y. McDonald 74779M-22-1X3/4 come with a warranty?
Absolutely. The A.Y. McDonald 74779M-22-1X3/4 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the A.Y. McDonald 74779M-22-1X3/4?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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