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Black malleable iron tee coupling with three female threaded ports

Value Brand

Value Brand Tee Coupling 3/8" FNPT Class 150 Malleable Iron

SKU CH-6QWJ-BWSQR

A 3/8" FNPT malleable iron tee rated Class 150 for 300 psi water, oil and gas service at 150°F and 150 psi saturated steam

  • Class 150 rating supports 300 psi water, oil or gas at 150 °F
  • UL listed and FM approved for code-compliant installations
  • Black malleable iron construction meets ASTM A-197 and A47 standards
  • 3/8 inch FNPT threads fit standard NPT piping systems
  • Conforms to ASME B 16.3 and B 16.14 dimensional requirements

3/8 Inch FNPT Tee for Piping Systems

This malleable iron tee connects three sections of 3/8 inch FNPT piping in residential and light commercial installations. It meets ASTM A-197, ASTM A47, ASME B 16.3 and B 16.14 standards and carries UL Listed and FM Approved markings. The Class 150 rating suits water, oil and gas lines up to 300 psi at 150 degrees F WOG and 150 psi saturated steam.

Class 150 Rating Under Continuous Pressure

The fitting maintains its 300 psi non-shock pressure rating during sustained service at 150 degrees F without degradation. Malleable iron construction resists cracking under prolonged mechanical stress and thermal cycling better than cast iron alternatives. It is not intended for systems that exceed the Class 150 pressure envelope or require higher temperature steam service.

Low Thermal Expansion and Silent Operation

Black malleable iron exhibits minimal thermal expansion so joints stay tight through heating and cooling cycles. The solid casting has no moving parts, producing zero operational noise in fluid systems. Pressure drop across the tee is negligible, imposing no additional pumping power requirement. It is not suited for applications demanding lightweight or corrosion-resistant alloys.

Highlights

  • Class 150 rating supports 300 psi water, oil or gas at 150 °F
  • UL listed and FM approved for code-compliant installations
  • Black malleable iron construction meets ASTM A-197 and A47 standards
  • 3/8 inch FNPT threads fit standard NPT piping systems
  • Conforms to ASME B 16.3 and B 16.14 dimensional requirements

Specifications

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Questions about this item

How much heat can the 3/8" malleable iron tee handle during continuous steam service?

It is rated for 150 psi saturated steam, which corresponds to roughly 150 °C, so the fitting will not degrade under normal steam-line temperatures.

What pipe threads must my existing piping have to connect this tee without adapters?

The tee has 3/8 inch FNPT threads on all three ports, so the mating pipes or nipples need matching 3/8 inch MNPT threads.

Will this Class 150 tee hold pressure if I reuse it on an older black-iron system that sees 300 psi water hammer?

The fitting is rated 300 psi WOG at 150 °F and meets ASTM A197 and ASME B16.3, so it is suitable for that pressure in a compatible iron system.

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