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Malleable iron pipe cap with FNPT threads, dark metal finish

Anvil

Anvil 0318901287 Malleable Iron Cap Class 300 3/8 in FNPT

SKU CH-EB84-CSGEA MPN 0318901287

A malleable iron pipe cap with Class 300 rating and 3/8-inch FNPT connection, rated to 2000 psi at 150 °F and 300 psi saturated steam at 550 °F

  • TypeDrain Components
  • Malleable iron construction withstands 2000 psi at 150 °F
  • Class 300 rating handles saturated steam to 300 psi at 550 °F
  • FNPT threads seal 3/8 in pipe without welding
  • Meets ASME B16.3, UL listed, FM and AAR approved
  • Operating range from -20 °F to 550 °F covers extreme conditions

Anvil Malleable Iron Cap Class 300

The Anvil 0318901287 is a malleable iron pipe cap rated for Class 300 service. It provides a secure FNPT threaded closure for 3/8 inch piping systems in industrial and commercial installations. The fitting meets ASME B 16.3 standards and carries AAR, FM and UL approvals. It suits engineers specifying durable drain components for high-pressure networks.

Pressure headroom up to 2000 psi at 150 °F

The cap handles saturated steam pressure of 300 psi at 550 °F and operates across a temperature range of -20 °F to 550 °F. It comfortably seals standard Class 300 pipelines carrying steam, water, oil or gas within these limits. The fitting reaches its pressure ceiling at 2000 psi, so systems exceeding that rating require a higher-class component.

3/8 inch FNPT connection decides fit

The single specification determining compatibility is the 3/8 inch FNPT thread size. Only pipes or fittings with a matching 3/8 inch MNPT thread will engage correctly. Buyers working with larger or smaller nominal pipe sizes, or those requiring a different thread standard, cannot use this cap.

Highlights

  • Malleable iron construction withstands 2000 psi at 150 °F
  • Class 300 rating handles saturated steam to 300 psi at 550 °F
  • FNPT threads seal 3/8 in pipe without welding
  • Meets ASME B16.3, UL listed, FM and AAR approved
  • Operating range from -20 °F to 550 °F covers extreme conditions

Specifications

TypeDrain Components
BrandAnvil
Model0318901287

Questions about this item

Will the 3/8 in FNPT threads on this Anvil 0318901287 cap mate with my existing Class 300 malleable iron piping?

Yes, the FNPT connection follows ASME B 16.3 dimensions so it threads onto any 3/8 in Class 300 malleable iron pipe or fitting with matching taper threads.

How can I confirm the cap is sealing properly after installation?

Pressurise the system up to 2000 psi at 150 °F or 300 psi saturated steam at 550 °F; no leakage at the joint shows the cap is working as intended.

Does the box include thread sealant or a gasket, or must I buy them separately?

The cap is supplied alone; thread sealant or PTFE tape suitable for 2000 psi service must be purchased separately.

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