A.Y. McDonald Quarter Bend Fit...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$38.57
A.Y. McDonald Quarter Bend Fitting, Flare x MNPT, No-Lead Brass

A.Y. McDonald Quarter Bend Fitting, Flare x MNPT, No-Lead Brass

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Model: 5121-160

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

$38.57
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A.Y. McDonald 5121-160 1" Quarter Bend Flare x MNPT Elbow, No Lead Brass

The A.Y. McDonald 5121-160 (also referenced as manufacturer part 74779M) is a 1" quarter bend elbow fitting configured with a flare connection on one end and a male NPT (MNPT) thread on the other. Built to No Lead (-NL) specifications, this brass fitting is designed for potable water and plumbing supply lines where a 90-degree directional change is needed between flared tubing and threaded pipe. Its compact, single-piece brass body makes it a reliable choice for tight routing in water service applications, whether installed underground, above-ground, or inside mechanical rooms. Plumbing contractors and waterworks installers rely on catalog fittings like the 5121-160 for accurate, code-compliant transitions that hold up under continuous water service pressure and thermal cycling.

Key Features

  • Trade Size: 1" connection size for standard water service and supply line installations.
  • Quarter Bend Configuration: 90-degree elbow design allows for efficient direction changes without additional fittings, reducing joint count and potential leak points.
  • Dual Connection Type: Flare fitting on one end paired with a male NPT (MNPT) thread on the other end, enabling a secure, leak-resistant transition between flared tubing and threaded pipe systems.
  • No Lead Compliant: Manufactured to -NL (No Lead) specifications for use in potable water applications, meeting modern regulatory requirements for drinking water systems.
  • Brass Construction: Durable brass body provides corrosion resistance and long service life in water distribution systems, standing up to the demands of buried and exposed piping alike.
  • Model Reference: Identified by manufacturer part number 74779M and catalog number 5121-160 for accurate cross-reference and reordering.

Technical Specifications

  • Product Type: Elbow
  • Size: 1"
  • Configuration: Quarter Bend (90°), Flare x MNPT
  • Compliance: No Lead (-NL)
  • Manufacturer Part Number: 74779M
  • Catalog Number: 5121-160

Typical Applications

  • Residential and Commercial Water Service Lines
  • Potable Water Distribution Systems
  • Flared Tubing to Threaded Pipe Transitions
  • Underground and Above-Ground Water Piping
  • Plumbing Repair and New Installation Projects

Why A.Y. McDonald?

A.Y. McDonald has long been trusted in the waterworks and plumbing industry for producing durable, code-compliant brass fittings. The 5121-160 quarter bend elbow's No Lead brass construction ensures it meets modern potable water standards while its flare x MNPT configuration provides a dependable connection between tubing and threaded pipe. Contractors specify A.Y. McDonald fittings for jobs where consistent dimensions, threading accuracy, and long-term corrosion resistance matter. Choose A.Y. McDonald for consistent quality and reliable performance in water supply installations, backed by a manufacturer with a long track record in the waterworks industry.

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Manufacturer Resources

Product Specs

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

A.Y. McDonald 5121-160 – Frequently Asked Questions

1) What sizes does the A.Y. McDonald quarter bend flare x MNPT elbow come in?
Two trade sizes: 3/4 inch, catalog number 5120-154, and 1 inch, catalog number 5121-160. Both are the same 90 degree quarter bend configuration with a flare connection on one end and male NPT thread on the other, in no-lead brass. Size is called out by the connection size, so a 3/4 inch fitting takes 3/4 inch flared tubing and threads into 3/4 inch NPT.
2) Can I use this A.Y. McDonald brass elbow on a potable water service line?
Yes. The quarter bend elbow is built to No Lead (-NL) specifications for potable water use, which is what water service and drinking water supply lines require. It is used on residential and commercial water service lines, potable water distribution, and both buried and above-ground piping.
3) What does the flare x MNPT configuration on this quarter bend connect to?
One end is a flare connection that mates to flared copper or soft tubing of the same nominal size, and the other is a male NPT thread that screws into a female NPT port, coupling, valve, or meter setter. It is the transition fitting when you have to turn 90 degrees and change from flared tubing to threaded pipe in one piece, instead of running an adapter plus an elbow.
4) Is A.Y. McDonald part 74779M the same thing as the 5121-160 elbow?
Same fitting. 5121-160 is the catalog number for the 1 inch quarter bend flare x MNPT elbow and 74779M is the manufacturer part number carried against it. Either number gets you the 1 inch size; the 3/4 inch version is catalog 5120-154.
5) Do I need a flare nut or insert with this A.Y. McDonald quarter bend, or does it come complete?
The elbow is a single-piece brass body with a flare seat machined on one end and male NPT thread on the other. Nothing else is supplied with it, so plan on the flare nut for your tubing and thread sealant or PTFE tape for the NPT side as separate line items on the job.
6) Will a brass flare elbow hold up buried underground on a water service?
Brass construction is the reason it is specified for buried work, giving corrosion resistance and long service life in water distribution. A.Y. McDonald lists the quarter bend for underground as well as above-ground water piping and mechanical room routing, and the flare joint is a mechanical connection that tolerates the thermal cycling a service line sees.
7) I need a 90 degree turn on 1 inch copper tubing with a threaded connection at the other end. One fitting or two?
One. The 1 inch quarter bend (5121-160) is a 90 degree elbow with the flare and the male NPT built into a single brass body, so you make the turn and the tubing-to-thread transition in one joint rather than stacking an adapter onto a separate elbow. Fewer joints, fewer places to leak.
How fast can I get the A.Y. McDonald 5121-160 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 5121-160 come with a warranty?
Absolutely. The A.Y. McDonald 5121-160 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 5121-160?
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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