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Black cast-iron threaded flange, 5 by 10 inches NPT, Class 125, UL and FM approved

Anvil

Anvil 0308003805 threaded flange 5 x 10 in NPT black cast iron trap

SKU CH-THPJ-FHYZC MPN 0308003805

A 5 x 10 inch NPT threaded flange made from black cast iron for drain and trap installations

  • TypeDrain Components
  • 5 x 10 in NPT flange fits large-diameter piping
  • Black cast iron construction resists corrosion in fire systems
  • Class 125 rating handles 175 psi at 150 °F
  • UL listed and FM approved for fire-protection use
  • Certified for potable water in California and Vermont

Threaded flange for fire protection piping

This Anvil 0308003805 threaded flange is a black cast-iron fitting designed for fire protection systems. It provides a flanged connection between 5-inch and 10-inch NPT pipe sizes. The component meets ASME B16.4 standards and carries UL listing plus FM approval for inspected fire protection equipment.

Pressure and temperature performance

The flange is rated for a maximum working pressure of 175 psi across a temperature range of -20 to 150 degrees Fahrenheit. Class 125 construction ensures reliable sealing under these conditions. The black cast-iron material handles the specified thermal cycling without degradation in normal fire protection service.

Potable water compliance constraint

This fitting is certified for potable water applications in California and Vermont. Installers working outside those jurisdictions or on non-potable fire suppression lines should verify local code acceptance before use.

Highlights

  • 5 x 10 in NPT flange fits large-diameter piping
  • Black cast iron construction resists corrosion in fire systems
  • Class 125 rating handles 175 psi at 150 °F
  • UL listed and FM approved for fire-protection use
  • Certified for potable water in California and Vermont

Specifications

TypeDrain Components
BrandAnvil
Model0308003805

Questions about this item

How do I install the 5 x 10 in NPT threaded flange and what step is often missed?

Thread the NPT ends into matching pipe using pipe sealant on male threads only; the step often missed is tightening to the correct torque so the cast-iron faces seat evenly without cracking.

What maintenance or replacement will the black cast-iron flange need over time?

Inspect the flanged joint annually for rust seepage or gasket weep; replace the gasket if leakage appears and repaint any exposed iron to maintain the protective coating.

What pressure or temperature limit will be reached first during sustained service?

The 175 psi working-pressure rating at 150 °F is the governing limit; sustained operation above either value exceeds the Class 125 design envelope.

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