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Copper reducing adapter, sweat to MNPT, shiny metallic finish

Nibco, Inc.

Nibco, Inc. 604-R 2" C x 1-1/2" MNPT Copper Reducing Adapter

SKU CH-T4ZS-ZZS2W

Connects 2" copper tubing to 1-1/2" MNPT threads for air, gas or potable water systems, rated to 364 psi at 100°F and 400°F maximum temperature

  • Reduces 2" copper tube to 1-1/2" MNPT for versatile transitions
  • Wrot copper construction resists corrosion in potable water systems
  • Handles 364 psi at 100°F for reliable pressure performance
  • Withstands 400°F maximum temperature for demanding applications
  • Sweat connection on copper side ensures leak-free solder joints

Application & Purpose

This NIBCO reducing adapter connects a 2" copper tube to a 1-1/2" male NPT thread for air, gases, or potable water systems. It suits plumbers and installers who need a sweat-to-thread transition in a single fitting.

Build & Connections

The wrot copper body uses a cup sweat end on one side and a male pipe thread on the other for a permanent solder joint and a removable threaded connection. Rated for 364 psi at 100°F and 400°F maximum temperature, it handles typical residential and light commercial pressure and heat.

Critical Specification

The reducing design steps down from a 2" nominal copper size to a 1-1/2" MNPT thread, so it only fits that exact combination. Buyers needing a straight coupling, a female thread, or a different diameter step-down must choose another part.

Highlights

  • Reduces 2" copper tube to 1-1/2" MNPT for versatile transitions
  • Wrot copper construction resists corrosion in potable water systems
  • Handles 364 psi at 100°F for reliable pressure performance
  • Withstands 400°F maximum temperature for demanding applications
  • Sweat connection on copper side ensures leak-free solder joints

Specifications

BrandNIBCO

Questions about this item

What pressure does the 604-R adapter handle at 100 °F?

The adapter is rated for a maximum operating pressure of 364 psi at 100 °F.

What tube and thread sizes does the 604-R connect?

Side A accepts a 2 1/8 in copper tube outer diameter; Side B provides a 1-1/2 in MNPT thread.

How do you install the 604-R and what step is often missed?

Clean the 2 1/8 in tube end, apply flux, insert fully into the cup, then sweat with lead-free solder; the step often missed is heating the fitting evenly so solder flows completely around the joint before cooling.

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