A.Y. McDonald 5121-194 Flare x...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$105.71
$55.71
A.Y. McDonald 5121-194 74753 1X3/4 ADAPTER FLARE X MNPT - NL

A.Y. McDonald 5121-194 Flare x MNPT Adapter, 1" x 3/4", No-Lead Brass

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Model: 5121-194
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$105.71
$55.71
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A.Y. McDonald 5121-194 Flare x MNPT Adapter, 1" x 3/4", No-Lead Brass

The A.Y. McDonald 5121-194 is a 1" x 3/4" flare x MNPT adapter, manufacturer part number 74753, engineered to transition between a flare tubing connection and a male national pipe thread (MNPT) connection. This no-lead (NL) brass fitting is designed for use in potable water piping systems where compliant, lead-free connections are required. The flare x MNPT configuration makes this adapter a practical solution for joining tubing runs to threaded pipe, valves, or fittings while maintaining a secure, leak-resistant seal without requiring additional couplings or transition hardware.

Key Features

  • Trade Size: 1" x 3/4" sizing accommodates transitions between differing pipe and tubing diameters, making it well suited for common residential and commercial service line configurations.
  • Connection Type: Flare x MNPT configuration allows the fitting to join a flared tube connection on one end to a male threaded pipe connection on the other, simplifying installation where two dissimilar connection types must be joined.
  • No-Lead Construction: Manufactured to no-lead (NL) brass specifications for use in potable water distribution applications, supporting compliant plumbing installations.
  • Model Reference: Identified by manufacturer part number 74753, corresponding to A.Y. McDonald catalog number 5121-194, for easy cross-reference and reordering.
  • Adapter Function: Provides a straightforward means of converting between flare and threaded pipe connections in a single fitting, reducing the number of components needed at a connection point.
  • Secure Sealing Design: The flare end is designed to mate with a compatible flare nut and tubing to create a leak-resistant seal, while the MNPT end threads directly into female-threaded valves, fittings, or fixtures.

Technical Specifications

  • Product Type: Pipe Fitting
  • Size: 1" x 3/4"
  • Connection: Flare x MNPT
  • Material: No-Lead Brass
  • Lead Status: No-Lead (NL)
  • Manufacturer Part Number: 74753
  • Catalog Number: 5121-194

Typical Applications

  • Potable Water Supply Line Connections
  • Tubing-to-Threaded Pipe Transitions
  • Residential and Commercial Plumbing Installations
  • Valve and Fixture Connection Points
  • Water Meter and Service Line Fittings

Why A.Y. McDonald?

A.Y. McDonald manufactures no-lead brass fittings built to support compliant, reliable potable water connections. The 5121-194 adapter's flare x MNPT design and no-lead brass construction make it a dependable choice for plumbing professionals who need a secure, code-compliant transition fitting for water supply installations, service lines, and fixture connections.

Manufacturer Resources

Product Specs

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

A.Y. McDonald 5121-194 – Frequently Asked Questions

1) What does the A.Y. McDonald 5121-194 adapter connect to on each end?
One end is a flare connection, the other is male NPT pipe thread. It's a 1 inch by 3/4 inch adapter, and fitting descriptions list the ends in the order they are named, so the flare side is the 1 inch end and the male NPT side is the 3/4 inch end. Use it where a flared copper or poly service line has to land on a female threaded port.
2) Is the A.Y. McDonald 5121-194 flare adapter safe for potable water service?
It carries the NL suffix, meaning no-lead brass, which is what water utilities and plumbing inspectors look for on potable water service lines. That makes it suitable for drinking water service work rather than being limited to non-potable use.
3) Do I need a flare nut or any other parts with the 5121-194 adapter, or is it a complete fitting?
Plan on the flare side hardware separately. The 5121-194 is the adapter body only, with a flare end and a male NPT end. Making up the flare joint takes a flare nut sized to the tubing plus properly flared tube, and the 3/4 inch male NPT end needs thread sealant or PTFE tape into its female port.
4) Can I use the A.Y. McDonald 5121-194 to step a 1 inch water service down to 3/4 inch?
Yes, that's exactly what it does. It takes a 1 inch flare connection and converts it to 3/4 inch male pipe thread, so it both changes the connection style and reduces the size in one fitting. No separate bushing needed.
5) What is the manufacturer part number for the A.Y. McDonald 1 inch flare by 3/4 inch MNPT no-lead adapter?
Order it as A.Y. McDonald 5121-194. The 74753 code also appears with this fitting in A.Y. McDonald's numbering, but 5121-194 is the part number to quote.
How fast can I get the A.Y. McDonald 5121-194 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 5121-194 come with a warranty?
Absolutely. The A.Y. McDonald 5121-194 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 5121-194?
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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