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Transparent 1-1/4 inch copper C x FNPT adapter with smooth finish

Legend Valve

Legend Valve 450-706 1-1/4" C x F Adapter bathware

SKU CH-3WWG-SV8BB

Connects 1-1/4 inch copper pipe to female NPT threads with a transparent adapter body

  • Size1-1/4 inx1-3/8 × 1-1/4
  • Product colorTransparent
  • Product typePipes, Valves & Fittings
  • Copper construction resists corrosion for long service life
  • Female NPT threads create a secure, leak-free joint
  • 1-1/4" C × FNPT size fits standard bath plumbing
  • Transparent finish allows quick visual inspection of connections
  • New condition ensures factory-fresh performance out of the box

Bathware adapter 1-1/4" copper

This Legend Valve 450-706 adapter connects 1-1/4 inch copper pipe to a female NPT thread. The fitting uses a transparent body with a 1-3/8 inch by 1-1/4 inch outside diameter. It suits residential bath plumbing where a sweat-to-thread transition is required. The part is supplied new and carries a California Proposition 65 warning for listed chemicals.

Suits copper-to-thread transitions

Installers joining 1-1/4 inch copper tube to a threaded female port will use this C x FNPT adapter. It does not serve compression, push-fit or PEX connections, nor does it fit other pipe diameters. Buyers needing a different end type or size should select another fitting. The Proposition 65 notice applies to this specific component.

1-1/4" C x FNPT copper adapter

The decisive specification is the 1-1/4 inch copper sweat inlet paired with a female NPT outlet. This single interface match determines whether the adapter fits the joint in question. Verify the pipe OD and thread standard before purchase. The warning for Proposition 65 listed chemicals remains with the product.

How it compares

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

Price $10.99
Cheaper than about 88% of the 1,499 comparable items (median $39.99).

Specifications

Product
Brand nameLEGEND VALVE
Product colorTransparent
Product typePipes, Valves & Fittings
Size & build
Size1-1/4 inx1-3/8 × 1-1/4

Questions about this item

How do I install the 1-1/4" copper sweat-to-FNPT adapter without leaks?

Clean the 1-1/4" copper pipe end and fitting socket with emery cloth, apply flux, insert fully, then solder evenly around the joint; the common mistake is insufficient heat causing a cold solder joint that leaks later.

What maintenance or replacement will the brass FNPT threads need over time?

Inspect the FNPT threads periodically for corrosion or mineral buildup; reapply PTFE tape or pipe dope when reassembling, and replace the adapter if threads show galling, cracking, or persistent seepage after re-sealing.

What is the first limit that appears under sustained hot-water pressure?

The copper-to-brass transition and solder joint typically reach their thermal-expansion and pressure limit first; prolonged high-temperature cycles can stress the joint before the pipe or threads themselves fail.

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