A.Y. McDonald 5120-144 3/4" 50...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$95.71
$45.71
A.Y. McDonald 5120-144 3/4" 501 FLARE UNION LF

A.Y. McDonald 5120-144 3/4" 501 Flare Union, Lead-Free Coupling

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Model: 5120-144
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A.Y. McDonald 5120-144 3/4" 501 Flare Union, Lead-Free Coupling

The A.Y. McDonald 5120-144 is a 3/4" 501 Flare Union, Lead-Free (LF), engineered to join flared tubing ends into a secure, leak-resistant connection. Manufactured to A.Y. McDonald's lead-free standards, this coupling is well suited for potable water supply lines and other plumbing and utility applications requiring a dependable flare-to-flare joint. The 3/4" trade size and 501 series flare union configuration deliver a straightforward, code-conscious way to connect sections of tubing without soldering or solvent welding, making it a practical choice for both new installations and repair work.

Key Features

  • Trade Size: 3/4" connection size for standard flare tubing applications.
  • Flare Union Design: 501 series flare union configuration provides a mechanical, solder-free joint between two flared tube ends.
  • Lead-Free (LF) Construction: Manufactured to lead-free specifications, supporting use in potable water and drinking water applications.
  • Reliable Sealing: Flare-style connection creates a tight mechanical seal at the union point, reducing the risk of leaks at the joint.
  • Serviceable Connection: Union design allows the joint to be disconnected and reconnected for maintenance or line servicing without cutting the tubing.
  • Model Identification: Stamped as model 5120-144 for easy cross-reference against manufacturer documentation.
  • A.Y. McDonald Manufacturing: Produced by A.Y. McDonald, a manufacturer of waterworks and plumbing fittings, with documentation available via the manufacturer spec sheet.

Technical Specifications

  • Product Type: Coupling
  • Trade Size: 3/4"
  • Series: 501
  • Configuration: Flare Union
  • Lead Content: Lead-Free (LF)
  • Model Number: 5120-144

Typical Applications

  • Potable Water Supply Lines
  • Residential and Commercial Plumbing Installations
  • Tubing-to-Tubing Flare Connections
  • Repair and Retrofit of Existing Flare-Joint Lines
  • New Construction Water Distribution Systems

Why A.Y. McDonald?

A.Y. McDonald's 5120-144 flare union is manufactured to lead-free standards, giving contractors and installers a dependable option for potable water applications where lead content requirements must be met. The 501 series flare union design offers a serviceable, solder-free joint that can be disconnected and reconnected as needed, simplifying maintenance on existing tubing runs. As a long-standing supplier of waterworks and plumbing fittings, A.Y. McDonald provides documented specifications for its products, supporting confident selection and code-compliant installation. Shop A.Y. McDonald plumbing fittings at ZenSupply for reliable, lead-free connection solutions for your next water supply project.

Manufacturer Resources

Spec Sheet

Product Specs

Department:
Plumbing
Product Group:
Plumbing
Product Subgroup:
Pipe Fittings
Product Type:
Coupling

A.Y. McDonald 5120-144 – Frequently Asked Questions

1) What size and connection type is the A.Y. McDonald 5120-144 union?
The A.Y. McDonald 5120-144 is a 3/4 inch flare union, model 501, in a lead free (LF) configuration. Both ends are flare, so it joins two runs of 3/4 inch flared soft copper or flexible tubing using flare nuts rather than solder or thread.
2) Is the 5120-144 union lead free for potable water service?
Yes. The 5120-144 carries the LF designation in its description, meaning it is A.Y. McDonald's lead free brass waterworks line, which is what municipalities and plumbers specify for drinking water service lines.
3) Can I use a flare union like the 5120-144 on a buried water service line?
Flare unions are the standard way to join 3/4 inch copper or poly service tubing underground, because a flare joint is mechanical and can be made in a wet trench with no torch or flux. The 5120-144 gives you two 3/4 inch flare ends to couple two tubing runs together. For poly pipe you still need the correct flare insert stiffeners at each end; the union itself supplies only the body and nuts.
4) What is the difference between a flare union and a compression coupling for 3/4 inch water service?
A flare union, like the A.Y. McDonald 5120-144, requires the tubing end to be flared with a flare tool, then the flare nut draws that cone against the union seat. A compression coupling grips unflared tubing with a gasket and gripper ring, so it goes on faster and works where you cannot get a flaring tool into the trench. Many utilities specify flare for copper service because the joint is metal to metal with no elastomer in the path. Check what your local water department's spec calls for before you pick.
5) Does the A.Y. McDonald 5120-144 need a gasket or extra parts to make up the joint?
No gasket is used. The 5120-144 is a two ended flare union, so the seal is made by the flared copper cone compressed against the brass seat by the flare nuts. What you do need is properly flared tubing on both sides, and for plastic service tubing, the matching insert stiffeners.
6) What part number do I order for the A.Y. McDonald 3/4 inch 501 flare union?
Order A.Y. McDonald manufacturer part number 5120-144. That is the 3/4 inch 501 series flare union in the lead free brass line, and it ships as a single piece with its flare nuts.
7) Is the 5120-144 a coupling or a valve?
It is a straight coupling, not a valve. The A.Y. McDonald 5120-144 joins two lengths of 3/4 inch tubing and has no shutoff. If you need to isolate the service, you want a curb stop or corporation stop instead.
How fast can I get the A.Y. McDonald 5120-144 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 5120-144 come with a warranty?
Absolutely. The A.Y. McDonald 5120-144 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 5120-144?
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
Why buy the A.Y. McDonald 5120-144 from ZenSupply?
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