Anvil 0318901287 Malleable Iron Cap Class 300 3/8 in FNPT
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
- Product 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.
How it compares
Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.
- Price $8.99
- Cheaper than about 86% of the 4,240 comparable items (median $31.99).
Specifications
| Product | |
|---|---|
| Brand name | Anvil |
| Model name | 0318901287 |
| Product type | Drain Components |
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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