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Malleable iron pipe cap with threaded connection

Value Brand

Value Brand 5P536 Cap 1" FNPT Malleable Iron 150

SKU CH-H564-DZB5P

A 1-inch malleable iron pipe cap rated for Class 150 service from -20 to 366 degrees Fahrenheit

  • 1-inch FNPT malleable iron cap seals pipe ends securely
  • Class 150 pressure rating handles standard plumbing demands
  • Operates from minus 20 °F to 366 °F for wide temperature range
  • ZORO SELECT brand ensures consistent manufacturing quality
  • California Proposition 65 warning lists cancer and reproductive-harm chemicals

1" Malleable Iron Cap

This 1-inch malleable iron cap provides a threaded closure for piping systems rated to Class 150. It suits plumbers and maintenance crews who need a durable fitting for water, oil, or gas lines within the specified pressure class. The fitting connects via female National Pipe Thread to match standard male-threaded pipe ends.

Threaded Installation Notes

The cap threads directly onto a 1-inch male NPT pipe end without requiring a separate seal or pre-applied thread sealant. Installers must supply their own thread tape or pipe dope to ensure a leak-free joint. Over-tightening can damage the iron casting, so the joint should be snugged to standard practice rather than forced.

Temperature and Pressure Limits

The Class 150 rating defines the maximum allowable pressure at the listed temperature range of -20 to 366 degrees Fahrenheit. Performance drops as temperature rises, so the fitting must not be used beyond these boundaries. California Proposition 65 warnings apply because the product contains chemicals identified by the state as carcinogens and reproductive toxins.

Highlights

  • 1-inch FNPT malleable iron cap seals pipe ends securely
  • Class 150 pressure rating handles standard plumbing demands
  • Operates from minus 20 °F to 366 °F for wide temperature range
  • ZORO SELECT brand ensures consistent manufacturing quality
  • California Proposition 65 warning lists cancer and reproductive-harm chemicals

Specifications

BrandZORO SELECT

Questions about this item

How can I confirm the 1" FNPT cap is sealing correctly after installation?

Pressure-test the joint up to the Class 150 rating and inspect for leaks; the malleable iron body is rated from -20 °F to 366 °F.

What comes in the box with the ZORO SELECT 5P536 cap and what must I supply?

The cap itself is supplied; thread sealant and any mating pipe or fittings are not included and must be purchased separately.

Which version of this malleable iron cap should I choose for a 1" nominal pipe system?

Select the 1" FNPT Class 150 model (5P536) — it matches 1" nominal pipe size and the 150 pressure class.

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