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Malleable iron square head plug with male NPT threads

Value Brand

Value Brand Square Head Plug 1" MNPT Malleable 5P545

SKU CH-EPQY-4M71Y

Malleable iron square head plug with 1 inch male NPT threads, rated Class 150 for -20 to 366 degrees F

  • Malleable iron construction resists cracking up to 366 °F
  • Male NPT threads seal 1 in pipe connections
  • Class 150 rating suits standard pressure systems
  • Operates reliably from -20 °F to 366 °F
  • California Prop 65 warning notes chemical exposure risk

Square Head Plug 1" MNPT Malleable

This square head plug provides a 1 inch male NPT connection made from malleable iron rated for Class 150 service. It suits plumbing systems that require a durable threaded closure for standard pipe fittings.

Fits standard 1 inch NPT threads

The plug threads directly into female NPT ports without additional sealant or seals included. Its cored construction reduces weight while the malleable iron body handles temperatures from minus 20 up to 366 degrees Fahrenheit in compatible piping networks.

Replaces worn or missing pipe plugs

Use this fitting when an existing square head plug is damaged, corroded or lost during maintenance. The upgrade is worthwhile whenever a reliable Class 150 rated closure is needed for 1 inch nominal pipe size in water, oil or gas lines.

Highlights

  • Malleable iron construction resists cracking up to 366 °F
  • Male NPT threads seal 1 in pipe connections
  • Class 150 rating suits standard pressure systems
  • Operates reliably from -20 °F to 366 °F
  • California Prop 65 warning notes chemical exposure risk

Specifications

BrandZORO SELECT

Questions about this item

At what temperature does the 150-class malleable iron plug reach its pressure limit during sustained use?

The Class 150 rating applies up to 366 °F; beyond that temperature the allowable pressure drops.

How much heat does the solid iron body radiate when hot fluid passes through it all day?

The plug itself generates no heat; it simply conducts the fluid temperature, reaching up to 366 °F in service.

Which thread sealant must I already have to install this 1" MNPT plug?

No sealant is pre-applied, so you need PTFE tape or pipe dope compatible with malleable iron threads.

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