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Copper reducing FNPT adapter with threaded end

Legend Valve

Legend Valve 450-739 Copper Reducing FNPT Adapter bathware

SKU CH-MBXW-CQVKQ

Connects 1-1/2 inch copper pipe to 1-1/4 inch female NPT threads in plumbing systems

  • Size1-1/2 in × 1-1/4 in
  • Product colorTransparent
  • Product typePipes, Valves & Fittings
  • Reduces pipe size from 1-1/2" to 1-1/4" for flexible copper plumbing connections
  • Copper construction resists corrosion and handles hot and cold water supply lines
  • Female NPT threads create a secure, leak-resistant joint without soldering on the threaded end
  • Sweat connection on the copper side allows a permanent, code-compliant bond with standard tubing
  • Proposition 65 notice informs installers of regulated chemical content for workplace safety compliance

Copper Reducing FNPT Adapter

The Legend Valve 450-739 is a copper reducing adapter designed to join 1-1/2" copper pipe to a 1-1/4" female NPT thread. It suits residential or light-commercial plumbing projects that require a secure transition between different pipe sizes and thread types. The fitting meets standard material specifications for copper alloy construction.

Installers needing a C x FNPT reduction

This adapter fits plumbers who must connect a 1-1/2" copper sweat end to a 1-1/4" FNPT connection in water supply or heating systems. It is not intended for installers who require a straight coupling, a different reduction ratio, a male-thread outlet, or a press-fit or push-fit connection method.

Proposition 65 notice included

The product documentation highlights California Proposition 65 warnings for chemicals known to cause cancer and reproductive harm. This information allows specifiers and installers to fulfil disclosure obligations on job sites where such notifications are required by state regulation. No additional accessories or software are bundled with the fitting.

How it compares

Measured against everything we stock in Bath Accessories & Soap Dispensers, at today’s prices. Recalculated every night.

Price $27.99
Cheaper than about 62% of the 1,499 comparable items (median $39.99).

Specifications

Product
Brand nameLEGEND VALVE
Product colorTransparent
Product typePipes, Valves & Fittings
Size & build
Size1-1/2 in × 1-1/4 in

Questions about this item

What size copper pipe do I need to solder into the C end of the 450-739 adapter?

The copper end accepts 1-1/2" copper tubing for a sweat connection.

Will the FNPT threads on this Legend Valve adapter mate with my existing 1-1/4" brass fittings?

Yes, the female NPT threads are cut to 1-1/4" so standard 1-1/4" male pipe threads will engage correctly.

How can I confirm the joint is watertight after soldering and threading the 450-739?

Pressurise the line and inspect both the soldered cup and the threaded connection for any moisture or drips.

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