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3/4 inch malleable iron pipe cap with threaded FNPT connection

Value Brand

Value Brand Cap 3/4 in FNPT Malleable Iron 150

SKU CH-SYSQ-C8EPR

A 3/4 inch FNPT malleable iron cap rated for 150 class service from -20 to 366 degrees F

  • Malleable iron construction handles 150 psi pressure rating
  • Threaded FNPT connection fits 3/4 inch nominal pipe size
  • Operating range from -20 to 366 degrees Fahrenheit
  • Ships free on orders of 75 or more
  • California Prop 65 warning for cancer and reproductive harm

3/4 inch FNPT malleable iron cap

This 3/4 inch nominal pipe size cap uses an FNPT threaded connection for industrial plumbing assemblies. The malleable iron body is rated for Class 150 service. It is supplied new without pre-applied thread sealant or an included seal. The component suits installers needing a standard threaded closure.

Class 150 pressure rating and temperature range

The Class 150 rating defines the pressure headroom for water, oil, or gas lines at ambient temperatures. The fitting operates continuously from minus 20 degrees up to 366 degrees Fahrenheit. Beyond that upper limit the material strength drops and the cap is no longer suitable. It handles typical industrial fluid temperatures but not high-temperature steam.

FNPT thread interface limits

The FNPT taper threads seal by metal-to-metal engagement and require external thread sealant for leak-free joints. Over-tightening can crack the malleable iron, so the joint must stop at the recommended engagement depth. The threads conform to the nominal 3/4 inch pipe standard and will not mate with metric or straight-thread ports.

Highlights

  • Malleable iron construction handles 150 psi pressure rating
  • Threaded FNPT connection fits 3/4 inch nominal pipe size
  • Operating range from -20 to 366 degrees Fahrenheit
  • Ships free on orders of 75 or more
  • California Prop 65 warning for cancer and reproductive harm

Specifications

BrandZORO SELECT

Questions about this item

Will the 3/4 in FNPT threads on this cap match the 3/4 in FNPT threads on my older malleable iron fittings?

Yes, the 3/4 in FNPT threads follow the standard taper, so they will engage correctly with existing 3/4 in FNPT malleable iron fittings.

How can I confirm the Class 150 rating is holding after I install the cap?

Pressurise the system up to the 150 psi class rating and check for leaks at the joint; the -20 to 366 °F range means the seal remains intact across that temperature span.

Does the box include thread sealant or a gasket, or do I need to buy them separately?

The specifications state no pre-applied thread sealant and no seal are included, so you will need to supply your own thread tape or pipe dope.

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