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Malleable iron square head pipe plug, dark metal finish, threaded end visible

Value Brand

Value Brand 2WU86 Malleable Iron Square Head Plug Class 150

SKU CH-3YE1-3GGBE

A 2-1/2 inch malleable iron square head plug rated Class 150 for 300 psi at 150°F and 150 psi saturated steam, meeting ASME B16.3, B16.4, ASTM A197 and A47 with FM and UL approval

  • Malleable iron construction withstands 300 psi pressure
  • Class 150 rating handles saturated steam at 150 psi
  • Operates reliably from -20 to 366 degrees F
  • ASME B 16.3 and B 16.4 compliant for quality assurance
  • FM Approved and UL Listed for safety verification

ZORO SELECT 2-1/2 Inch MNPT Plug

This malleable iron square head plug fits 2-1/2 inch male NPT threads and carries Class 150 pressure ratings. It meets ASME B 16.3, B 16.4, ASTM A-197 and ASTM A47 standards with FM and UL listings. The cored construction reduces weight while maintaining structural integrity for plumbing and industrial piping systems. Suitable for installers who need a listed fitting for code-compliant assemblies.

Suits installers needing a rated NPT plug

Builders who require a different pipe size, female threads or a higher pressure class should select another fitting. Systems that operate beyond 300 psi at 150 °F or above 150 psi saturated steam pressure exceed this plug's rated limits. Applications needing non-iron materials or specialised coatings are not addressed by this model.

Class 150 rating with 300 psi at 150 °F maximum

This single specification defines the plug's safe operating envelope for water, oil, air and saturated steam up to 150 psi. The temperature range spans -20 °F to 366 °F, covering typical heating and process piping conditions. Verifying the system design pressure against this rating confirms whether the plug is the correct component.

How it compares

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

Price $6.99
Cheaper than about 78% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameZORO SELECT

Questions about this item

Will the 2-1/2 in MNPT threads on this Class 150 plug match the existing galvanised nipples I already have installed?

Yes, the male NPT threads follow ASME B16.3 and B16.4 dimensions, so they will engage standard 2-1/2 in female NPT fittings you are keeping.

How can I confirm the plug is sealed correctly after I thread it into the pipe?

Pressurise the system up to 300 psi at 150 °F or 150 psi saturated steam; no leakage at the joint means the cored square head is sealing as intended.

Does the box include thread sealant or a wrench for the square head, or must I buy those separately?

Only the malleable iron plug is supplied; pipe thread sealant and a suitably sized square-head wrench are not included and must be purchased separately.

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