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Black malleable iron reducer coupling, threaded ends, 3 inch to 1-1/2 inch

Anvil

Anvil 0310546403 Reducer Coupling 3 in x 1 1/2 in Class 300

SKU CH-XTHG-GSR97 MPN 0310546403

A malleable iron reducer coupling joins 3-inch and 1½-inch NPT threads, rated to 1000 psi at 150 °F and 300 psi saturated steam at 550 °F, with AAR, FM, ASME B16.3 and UL approvals

  • TypeDrain Components
  • Handles 1000 psi at 150°F for high-pressure reliability
  • Withstands 300 psi saturated steam at 550°F for extreme heat
  • Operates from -20°F to 550°F across demanding temperature ranges
  • Meets ASME B 16.3 and UL Listed for code compliance
  • Malleable iron construction with FNPT connections for durable installation

3-inch by 1½-inch malleable iron reducer coupling

This Class 300 fitting joins a 3-inch FNPT pipe to a 1½-inch FNPT pipe in drain and trap assemblies. It is built from malleable iron and carries AAR, FM and UL approvals while meeting ASME B16.3. The coupling suits new installations and repairs in commercial or industrial plumbing systems.

Pressure and temperature limits in normal service

The fitting withstands up to 1000 psi at 150 degrees F and 300 psi saturated steam at 550 degrees F. Its continuous operating range spans -20 degrees to 550 degrees F. These ratings cover typical hot-water, steam and condensate return lines without additional derating.

Approvals and standards simplify code compliance

AAR, FM and UL listings let inspectors verify the coupling against recognised marks. Conformance to ASME B16.3 confirms dimensional and material requirements for threaded malleable iron fittings. No extra software or accessories are included; the markings on the body serve as the compliance reference.

Highlights

  • Handles 1000 psi at 150°F for high-pressure reliability
  • Withstands 300 psi saturated steam at 550°F for extreme heat
  • Operates from -20°F to 550°F across demanding temperature ranges
  • Meets ASME B 16.3 and UL Listed for code compliance
  • Malleable iron construction with FNPT connections for durable installation

Specifications

TypeDrain Components
BrandAnvil
Model0310546403

Questions about this item

How do I install the 3 in x 1 1/2 in FNPT reducer coupling without stripping the threads?

Apply PTFE tape or pipe dope to the male threads only, hand-tighten until snug, then turn one to two full turns with a strap wrench on the malleable iron body — never use a pipe wrench directly on the coupling or you will crack the Class 300 casting.

What maintenance or replacement will this malleable iron reducer coupling need over time?

Inspect the FNPT joints annually for weeping; re-apply thread sealant if seepage appears. The malleable iron body itself requires no scheduled replacement within the -20 to 550 °F range unless mechanical damage or severe corrosion occurs.

Which pressure-temperature limit will be reached first during continuous saturated steam service?

The 300 psi saturated steam rating at 550 °F is the governing limit; the 1000 psi @ 150 °F cold-water rating does not apply once steam temperature rises above 150 °F.

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