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Black malleable iron pipe cap with internal threads

Value Brand

Value Brand 4" Pipe Cap FNPT Malleable Iron 150

SKU CH-7X3X-HDV1H

Seals the end of a 4-inch pipe with a Class 150 malleable iron female NPT thread rated from -20 to 366 degrees Fahrenheit

  • 4 in nominal pipe size for standard plumbing connections
  • Malleable iron construction rated for Class 150 service pressure
  • Threaded FNPT design enables direct pipe attachment
  • Operating range from -20 to 366 degrees Fahrenheit
  • California Proposition 65 warning for chemical exposure awareness

4-Inch Malleable Iron Pipe Cap

This pipe cap provides a secure threaded closure for 4-inch nominal pipe systems. The malleable iron construction meets Class 150 pressure ratings for standard plumbing installations. It is designed for use with female NPT connections in residential and commercial piping networks.

Class 150 Pressure Rating

The fitting is rated for Class 150 service, making it suitable for standard pressure plumbing applications. It operates across a temperature range of -20 to 366 degrees Fahrenheit. No pre-applied thread sealant or seal is included with the cap.

For Standard Threaded Pipe Closures

This cap suits plumbers and maintenance teams terminating 4-inch male NPT pipe ends in water, gas or air lines. It is not intended for systems exceeding Class 150 pressure limits or for installations requiring integral sealing compounds. Buyers needing different nominal sizes or pressure classes should select alternative fittings.

How it compares

Measured against everything we stock in Hose Fittings, Adapters & Clamps, at today’s prices. Recalculated every night.

Price $20.99
Pricier than about 55% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameZORO SELECT

Questions about this item

What does the Class 150 rating mean when the cap is installed on a pipe?

Class 150 indicates the pressure rating for the malleable iron cap at its maximum operating temperature of 366 Degrees F.

How does the FNPT thread standard affect compatibility with other fittings?

FNPT provides a tapered female thread that seals with a matching male NPT thread when tightened, commonly used for pipe connections.

What size pipe and thread does this 4 in nominal cap fit?

The cap fits a 4 in nominal pipe size with FNPT threads, designed for Class 150 malleable iron piping systems.

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