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Bronze reducing adapter coupling with sweat and threaded ends

Nibco, Inc.

Nibco, Inc. 703R-LF 3/4 x 3/8 Reducing Adapter Coupling Low-Lead Cast Bronze

SKU CH-E4TD-7BJB7

A low-lead bronze reducing adapter joins 3/4 inch copper tube to 3/8 inch FNPT for potable water up to 466 psi and 200 Degrees F

  • Low-lead bronze meets NSF/ANSI 61 for potable water safety
  • NSF/ANSI 372 certified for lead-free compliance
  • Rated to 466 psi maximum operating pressure
  • Withstands 200 Degrees F maximum operating temperature
  • Manufactured under ISO 9001 quality management system

Reducing Adapter for Potable Water Systems

The NIBCO 703R-LF is a straight sweat fitting adapter made from low-lead cast bronze grade C87850. It connects a 3/4 inch copper tube on side A to a 3/8 inch FNPT thread on side B. The fitting meets ASME B 16.18, NSF/ANSI 61 and NSF/ANSI 372 standards for potable water use. It is intended for plumbers and installers working on residential or commercial water supply lines.

Low-Lead Bronze Material and Certified Standards

The C87850 bronze construction satisfies low-lead requirements for drinking water safety. Compliance with NSF/ANSI 61 and NSF/ANSI 372 confirms the fitting is approved for contact with potable water. ISO 9001 certification indicates the manufacturing process follows recognised quality management systems. These credentials allow the adapter to be used in code-compliant installations without additional material verification.

Pressure and Temperature Headroom for Hot

The adapter handles a maximum operating pressure of 466 psi and a maximum operating temperature of 200 degrees F. This capacity covers typical municipal supply pressures and standard hot water heater output. The straight adapter shape introduces minimal flow restriction between the dissimilar connection sizes. Installers should verify that system design pressures and temperatures remain within these rated limits.

How it compares

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

Price $12.99
Cheaper than about 63% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameNIBCO

Questions about this item

Will the C87850 bronze body or the sweat joint need replacement under normal potable-water service?

The C87850 low-lead bronze body is rated for 466 psi at 200 °F and meets NSF/ANSI 61 and 372, so it does not require scheduled replacement if installed correctly and water chemistry stays within potable limits.

What pressure or temperature limit will be reached first during continuous hot-water circulation?

The 200 °F maximum operating temperature is the first hard limit; sustained pressure must remain below 466 psi, and the ASME B 16.18 rating guarantees the joint holds up to that temperature.

Does the bronze adapter transmit vibration or heat that could cause noise in a long horizontal run?

Bronze conducts heat efficiently, so the fitting will reach fluid temperature quickly, but it has no moving parts and creates no mechanical noise; expansion noise depends on pipe support spacing, not the adapter itself.

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