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Straight malleable iron coupling with female threaded ends

Value Brand

Value Brand 5P553 Coupling 3/4" FNPT Malleable Iron Class 150

SKU CH-WMBR-K213H

Connects 3/4 inch FNPT pipes using malleable iron construction rated for Class 150 service

  • 3/4" FNPT threaded connection fits standard pipe sizes
  • Malleable iron construction provides durable mechanical strength
  • Class 150 pressure rating suits typical plumbing systems
  • Compact design with 14 thread specification ensures secure engagement
  • ZORO SELECT brand identifies the product line

Value Brand 5P553 Coupling Overview

The Value Brand 5P553 coupling connects two sections of 3/4 inch pipe using female National Pipe Thread ends. It is made from malleable iron rated for Class 150 service. Plumbers and maintenance technicians use it to extend or repair threaded piping systems in commercial and residential installations.

Installation Notes and Common Issues

The coupling threads onto standard 3/4 inch male NPT pipe without special tools beyond a pipe wrench and appropriate thread sealant. Malleable iron requires careful tightening to avoid cracking the fitting. The most common issue is cross-threading or over-torquing, which can damage the threads and cause leaks at the joint.

Class 150 Pressure Rating Decides Fit

The Class 150 designation defines the maximum working pressure this coupling can safely handle at standard temperatures. Buyers must verify that their system pressure does not exceed this rating. The coupling is not suitable for high-pressure hydraulic lines or steam service above the Class 150 limit. Buyers needing higher pressure ratings must select a different class of fitting.

Highlights

  • 3/4" FNPT threaded connection fits standard pipe sizes
  • Malleable iron construction provides durable mechanical strength
  • Class 150 pressure rating suits typical plumbing systems
  • Compact design with 14 thread specification ensures secure engagement
  • ZORO SELECT brand identifies the product line

Specifications

BrandZORO SELECT

Questions about this item

How can I confirm the 3/4" FNPT threads seal properly after installing the Class 150 malleable iron coupling?

Pressure-test the joint up to the Class 150 rating and check for leaks at both 3/4" female threaded ends; a dry, tight seal confirms correct installation.

What comes with the 5P553 coupling and what additional fittings or sealant must I purchase separately?

The box contains the single malleable iron coupling with 3/4" FNPT threads; pipe-thread sealant or tape and the mating pipes are not included.

When should I choose the Class 150 version instead of a different pressure class for a 3/4" FNPT malleable iron coupling?

Select the Class 150 model when your system design calls for a 150 psi working-pressure rating at the 3/4" FNPT connection size.

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