A.Y. McDonald 504 Flare x MIP ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$51.43
A.Y. McDonald 504 Flare x MIP Adapter Fitting

A.Y. McDonald 504 Flare x MIP Adapter Fitting

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Model: 5120-139

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

$51.43
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A.Y. McDonald 5120-139 3/4" 504 Flare x MIP Adapter Fitting

The A.Y. McDonald 5120-139 is a 3/4" 504 series Flare x MIP (Male Iron Pipe) adapter fitting engineered to provide a secure, dependable transition between flare-style tubing connections and male threaded pipe connections. This 3/4" adapter is a common component in water service and distribution piping runs, where installers need a reliable way to join a flare-tube run to threaded pipe or a threaded fitting without introducing weak points into the system. Backed by A.Y. McDonald's long-standing reputation for durable waterworks and plumbing fittings, the 5120-139 is manufactured to deliver a leak-resistant joint suited to its intended residential and light commercial applications. As part of the 504 series of adapter fittings, this part is designed for consistent fit, dimensional accuracy, and repeatable performance from batch to batch, which is exactly what contractors and maintenance crews rely on when specifying replacement or rough-in fittings for water service lines.

Key Features

  • Trade Size: 3/4" connection size, sized for standard residential and light commercial water service lines.
  • Connection Type: Flare x MIP (Male Iron Pipe) configuration allows this single adapter body to join flare tubing on one end to male-threaded pipe or fittings on the other.
  • Series Designation: Part of the A.Y. McDonald 504 series of adapter fittings, engineered for consistent fit and repeatable performance across production runs.
  • Adapter Function: Provides a straightforward, single-fitting transition point between two different connection styles, simplifying installation and reducing the number of fittings needed in a run.
  • Leak-Resistant Design: Built to create a secure, dependable joint between flare and threaded connections when properly installed.
  • Manufacturer-Documented: Full specifications for this part number are available on A.Y. McDonald's published spec sheet, supporting accurate specification and ordering.

Technical Specifications

  • Product Type: General Fitting
  • Trade Size: 3/4"
  • Connection: Flare x MIP
  • Series: 504

Typical Applications

  • Residential Water Service Lines
  • Plumbing Fitting Transitions Between Tubing and Threaded Pipe
  • New Construction Plumbing Rough-In
  • Plumbing Repair and Replacement Projects
  • Light Commercial Water Distribution Piping

Why A.Y. McDonald?

A.Y. McDonald has long been a trusted source for waterworks and plumbing fittings, and the 5120-139 3/4" 504 Flare x MIP Adapter continues that standard with a fitting engineered for a dependable transition between flare and threaded pipe connections. Choosing A.Y. McDonald parts for your water service installation helps ensure consistent fit, dimensional accuracy, and reliable joint performance for professional and DIY projects alike, and having the manufacturer's documented spec sheet available makes it easy to confirm this fitting is correct for your specific rough-in or repair job before installation begins.

Manufacturer Resources

Spec Sheet

Product Specs

Product Group:
Plumbing
Product Type:
General Fitting
Product Subgroup:
Fittings
Department:
Plumbing

A.Y. McDonald 5120-139 – Frequently Asked Questions

1) What sizes does the A.Y. McDonald 504 flare x MIP adapter come in?
Three trade sizes: 3/4 inch (part 5120-139), 1 inch (5121-140), and 1-1/2 inch (5122-140). Order by trade size, and the same size applies to both ends of the adapter body, flare on one side, male iron pipe thread on the other.
2) What does a flare x MIP adapter actually connect?
It joins a flare-style tubing connection on one end to male iron pipe threads on the other, so you can tie a flare tube run into threaded pipe or a female threaded fitting with one part instead of stacking couplings. The A.Y. McDonald 504 series is built for that single transition point in water service and distribution runs.
3) I need to match an existing 1 inch flare service line. Which part number do I order?
Order 5121-140, the 1 inch size in the A.Y. McDonald 504 adapter range. Confirm the existing line is a flare connection and not compression, since the two are not interchangeable even at the same trade size.
4) Is the 504 adapter right for a residential water service line, or is it a commercial waterworks part?
A.Y. McDonald lists the 504 adapter for residential water service lines, plumbing rough-in, repair work, and light commercial water distribution piping. For heavier commercial or municipal service mains, spec a fitting rated for that duty instead.
5) Do I need a flare nut or ferrule with the A.Y. McDonald 504 adapter?
The flare end mates to tubing that has been properly flared, so you need the matching flare nut on the tube. Flare connections seal metal to metal on the flare face, not with a ferrule or compression ring, so the joint depends on a clean, square flare cut to the right size for that trade size.
6) Can I use this adapter to screw into a female threaded valve or fitting?
Yes. The MIP end is male iron pipe thread, so it threads into any female iron pipe port of the same trade size, such as a valve, tee, or meter fitting. Use thread sealant or PTFE tape on the tapered threads; the flare end seals on its own and should get no tape.
7) Is the 1-1/2 inch version the same fitting, just bigger?
Same flare x MIP adapter function, sized up. Part 5122-140 covers the 1-1/2 inch trade size and is used where a larger service or distribution run needs the same flare-to-threaded transition.
How fast can I get the A.Y. McDonald 5120-139 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 5120-139 come with a warranty?
Absolutely. The A.Y. McDonald 5120-139 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 5120-139?
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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