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Bronze sweat union fitting with copper cup and FNPT threads

Nibco, Inc.

Nibco, Inc. 733-3-LF 2 in Sweat Union Bronze C x FNPT

SKU CH-FE5B-SFVZX

A 2-inch sweat-to-FNPT bronze union rated 291 psi and 200 °F for potable water systems, meeting ASME B16.18, NSF/ANSI 61 and 372 low-lead standards

  • Low-lead bronze meets NSF/ANSI 372 for potable water
  • ASME B16.18 compliant for reliable sweat connections
  • Rated 291 psi at 200 °F for demanding systems
  • ISO 9001 certified manufacturing ensures consistent quality
  • Straight union design joins 2 in copper tube to FNPT threads

Copper Sweat Union for Potable Water

This straight union joins 2-inch copper tube to a 2-inch female NPT thread using a sweat connection on the tube side. The body is cast from low-lead bronze alloy C87850 and meets NSF/ANSI 61 and NSF/ANSI 372 for drinking water safety. It is intended for plumbers and contractors installing or repairing potable water lines in residential and commercial buildings.

Rated for Continuous Pressure and Temperature

The fitting withstands a maximum operating pressure of 291 psi and a maximum operating temperature of 200 degrees Fahrenheit. These limits apply to sustained service conditions rather than brief test spikes. Compliance with ASME B16.18 and ISO 9001 confirms the manufacturing quality required for long-term reliability in pressurised plumbing systems.

Bronze Construction Handles Thermal Cycling

The bronze material resists corrosion and maintains seal integrity through repeated heating and cooling cycles typical of hot water distribution. No external power or moving parts are involved, so noise and power draw are not applicable. The sweat joint and threaded end provide a secure mechanical seal under normal operating conditions.

Highlights

  • Low-lead bronze meets NSF/ANSI 372 for potable water
  • ASME B16.18 compliant for reliable sweat connections
  • Rated 291 psi at 200 °F for demanding systems
  • ISO 9001 certified manufacturing ensures consistent quality
  • Straight union design joins 2 in copper tube to FNPT threads

Specifications

BrandNIBCO

Questions about this item

Does the 291 psi rating mean the union runs hot or noisy when the water circulates all day?

No — it is a passive bronze fitting with no moving parts, so it generates no noise or heat and draws no power.

What pipe and tools must I already have to install the 2 in cup × FNPT union?

You need 2 in copper tube (2 1/8 in OD) for the sweat side, 2 in NPT male threads for the other side, flux, lead-free solder and a torch.

Will the ASME B 16.18 and NSF/ANSI 61 markings let me join it to older copper and galvanised pipe already in the house?

Yes — the cup end solders to existing copper to ASME B 16.18, and the FNPT end threads onto 2 in NPT galvanised or brass pipe.

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