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Straight bronze coupling with cup and male thread ends

Nibco, Inc.

Nibco, Inc. 704R-LF 3/4X11/4 Straight Bronze Coupling

SKU CH-BME6-PNM5C

A sweat-to-threaded bronze adapter joins 3/4 in copper tube to 3/4 in male pipe for potable water at up to 466 psi and 200 °F

  • Connects 3/4 in copper tube to 3/4 in MNPT threads
  • Lead-free bronze meets NSF/ANSI 61 Annex G for potable water
  • Rated 466 psi at 200 °F for high-pressure systems
  • Sweat cup end simplifies solder installation on site
  • Complies with ASME B16.18 and ASTM B584 standards

Bronze Straight Adapter for Potable Water

The NIBCO 704R-LF is a bronze straight adapter designed for potable water systems. It connects a 3/4 inch copper tube on the cup side to a 3/4 inch male NPT thread on the other. The fitting meets ASME B 16.18, ASTM B584, and NSF/ANSI 61 Annex G standards. It is rated for a maximum operating pressure of 466 psi and a maximum operating temperature of 200 degrees F.

Suits Copper-to-Thread Transitions.

This adapter suits plumbers joining copper tubing to threaded pipe in potable water lines. The bronze construction and certifications support safe drinking water use. It is not intended for gas, oil, or compressed air systems. Installers needing press, push-fit, or flanged connections should select a different fitting type.

Cup and MNPT End Configuration Decides Fit

The defining specification is the combination of a 3/4 inch cup connection on side A and a 3/4 inch male NPT connection on side B. Both ends share a 7/8 inch tube outer diameter. Verify that both the tubing size and the thread standard match your piping before purchase.

How it compares

Measured against everything we stock in Hose Fittings, Adapters & Clamps, at today’s prices. Recalculated every night.

Price $20.99
Pricier than about 55% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameNIBCO

Questions about this item

Does the 704R-LF coupling include solder or flux for the 3/4 in sweat connection?

The fitting is supplied as the bronze adapter only; solder and flux for the 3/4 in cup joint must be purchased separately.

When should I choose the 3/4 in copper tube size versus a different diameter?

Select this 3/4 in CTS fitting when your piping uses 7/8 in OD copper tube and a 3/4 in male NPT thread is required.

What does the 466 psi rating mean for a residential hot-water system?

It indicates the bronze adapter can safely handle pressures up to 466 psi at temperatures up to 200 °F, well above typical household conditions.

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