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Malleable iron threaded cap trap, 4 inch FNPT, Class 150 finish

Anvil

Anvil 0318901006 Cap Trap 4" FNPT Malleable Iron Class 150

SKU CH-D14A-GV1ND MPN 0318901006

A 4-inch malleable iron cap with FNPT threads rated for Schedule 40 and 80 pipe up to 300 psi at 150°F

  • TypeDrain Components
  • 4" FNPT threads connect directly to Schedule 40 and 80 pipe
  • Malleable iron construction rated to 300 psi at 150 °F and 150 psi steam at 350 °F
  • Solid plug design handles temperatures from -20 °F to 350 °F
  • ASTM A197 grade iron provides proven strength for drainage systems
  • Class 150 pressure class suits standard commercial and residential plumbing

4-Inch Malleable Iron Cap

This Anvil 0318901006 cap provides a solid-threaded closure for 4-inch nominal pipe systems. It is manufactured from A197 malleable iron rated to Class 150 standards. The fitting handles 300 psi at 150 degrees F and 150 psi at 350 degrees F saturated steam. It suits plumbing and industrial piping installations requiring a durable end cap.

For Schedule 40 and 80 Threaded Lines

This cap fits Schedule 40 and Schedule 80 pipe with FNPT threads across a -20 to 350 degrees F range. It is not for systems exceeding the Class 150 pressure-temperature ratings. Buyers needing a sealed plug with an integral gasket or pre-applied thread sealant should select a different component.

Class 150 Pressure Rating

The decisive specification is the Class 150 rating, which sets the maximum operating pressure at 300 psi at 150 degrees F and 150 psi at 350 degrees F steam. Verify that your system design stays within these limits before installation.

Highlights

  • 4" FNPT threads connect directly to Schedule 40 and 80 pipe
  • Malleable iron construction rated to 300 psi at 150 °F and 150 psi steam at 350 °F
  • Solid plug design handles temperatures from -20 °F to 350 °F
  • ASTM A197 grade iron provides proven strength for drainage systems
  • Class 150 pressure class suits standard commercial and residential plumbing

Specifications

TypeDrain Components
BrandAnvil
Model0318901006

Questions about this item

What size pipe thread does the 4" FNPT cap require on the existing line?

The cap uses a 4-inch FNPT thread and is rated for Schedule 40 and Schedule 80 pipe.

Will the malleable iron cap handle the same pressure and temperature as my older Class 150 fittings?

Yes, it is rated for 300 psi at 150 °F and 150 psi steam at 350 °F, matching Class 150 limits.

How can I confirm the cap is sealing correctly after I thread it onto the pipe?

Pressurise the system up to the 300 psi rating and check for leaks at the joint; the solid plug construction has no internal seal to fail.

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