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Malleable iron pipe cap with FNPT threads, Class 150 rating

Anvil

Anvil 0318900602 Malleable Iron Cap Class 150 trap

SKU CH-DPHX-Y1JR6 MPN 0318900602

A malleable iron cap with Class 150 rating for 1-inch FNPT pipe connections, rated to 300 psi at 150 °F and 150 psi saturated steam at 350 °F

  • Product typeDrain Components
  • Malleable iron construction resists corrosion and mechanical stress
  • Class 150 rating supports 300 psi at 150 °F
  • ASME B 16.3 compliance ensures dimensional reliability
  • FNPT connection simplifies installation on 1 in pipe
  • Service range from −20 °F to 350 °F suits steam and water systems

Anvil Malleable Iron Cap Class 150

This Anvil 0318900602 cap is a drain component designed for piping systems requiring a Class 150 pressure rating. It suits installers needing a durable malleable iron fitting with a 1 inch FNPT connection to seal a pipe end. The fitting meets ASME B 16.3 standards and carries UL and FM approvals for code compliance.

Sustained pressure and temperature performance

The cap handles a maximum pressure of 300 psi at 150 degrees F and a saturated steam pressure of 150 psi at 350 degrees F. Its operational temperature range extends from -20 degrees to 350 degrees F. These ratings define its behaviour under continuous thermal and hydraulic load rather than brief test spikes.

Verify pipe size and thread compatibility

Confirm the existing pipe uses a 1 inch FNPT thread to match this fitting connection type. Ensure the system design operates within the Class 150 pressure class and the stated temperature limits. Check that malleable iron material is suitable for the intended fluid media and environmental conditions.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $3.99
Cheaper than about 95% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameAnvil
Model name0318900602
Product typeDrain Components

Questions about this item

How much heat can the 1 in malleable iron cap withstand when the system runs continuously?

The cap handles saturated steam up to 350 Degrees F and a continuous temperature range of -20 Degrees to 350 Degrees F.

What pipe thread does the 1 in cap need to connect to existing plumbing?

It uses a 1 in FNPT connection that threads directly onto a matching male NPT pipe end.

Will the Class 150 cap hold pressure on a legacy steel piping system rated for 300 psi?

Yes, the cap is rated 300 psi at 150 Degrees F and meets ASME B 16.3, so it matches older Class 150 steel systems.

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