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Black malleable iron square head pipe plug three inch

Anvil

Anvil 0318902640 Malleable Iron Square Head Plug Class 150 3 in trap

SKU CH-R7TM-KYDDY MPN 0318902640

Malleable iron square head plug seals 3-inch NPT drain openings up to 350 °F and Class 150 pressure

  • TypeDrain Components
  • MaterialHAWA
  • Malleable iron construction provides durable corrosion resistance
  • Square head design allows secure wrench tightening
  • Class 150 rating suits standard pressure systems
  • Male NPT threads ensure compatible pipe connections
  • Operates reliably from -20 to 350 degrees F

Anvil 3 in Square Head Plug

The Anvil 0318902640 is a Class 150 malleable iron square head plug built for 3 in nominal pipe size. It fits male NPT threads in plumbing and drainage systems where a solid, removable closure is required. The black finish identifies the fitting for standard service. This component serves installers and maintenance crews who need a dependable threaded seal.

Temperature rating and pressure class

Rated from 20 to 350 degrees F, the plug handles hot water, steam and chilled lines within that range. Its Class 150 designation matches the pressure requirements of the connected piping system. No pre-applied thread sealant or separate seal is included so the installer selects the appropriate compound. The solid construction resists deformation under normal thermal cycling.

Replaces worn or missing drain plugs

Use this plug to replace a corroded, cracked or lost square head plug in existing Class 150 iron piping. The upgrade is worth it when the old fitting leaks, rounds off during removal or no longer holds pressure. It is not suited for systems that require a hex head, a different pressure class or an integrated sealing washer.

Highlights

  • Malleable iron construction provides durable corrosion resistance
  • Square head design allows secure wrench tightening
  • Class 150 rating suits standard pressure systems
  • Male NPT threads ensure compatible pipe connections
  • Operates reliably from -20 to 350 degrees F

Specifications

TypeDrain Components
MaterialHAWA
BrandAnvil
Model0318902640

Questions about this item

How do I install the Anvil 0318902640 square head plug and what is the common mistake?

Thread the 3 in male NPT plug into the female fitting using a wrench on the square head. The step people get wrong is applying PTFE tape or pipe dope despite the product not including pre-applied thread sealant.

What maintenance or replacement will this malleable iron plug need later?

Inspect the iron threads and square head periodically for corrosion or rounding. Replace the plug if the Class 150 pressure boundary is compromised or if the head deforms and prevents proper tool engagement.

What is the temperature limit that appears first under sustained use?

The plug is rated from -20 degrees to 350 degrees F. Sustained operation near 350 degrees F will reach the maximum service temperature before the Class 150 pressure rating becomes the limiting factor.

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