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Bronze spring check valve with threaded FNPT connections, yellow polyethylene tag attached

Milwaukee Valve

Milwaukee Valve UP548T 1 1/2" Bronze Spring Check Valve bath faucet part

SKU CH-RZS3-8Q076

Inline spring check valve with bronze body and FNPT connections, rated 250 psi at 150 °F and 353 °F maximum temperature

  • TypeOther
  • Spring-loaded inline design prevents backflow automatically
  • Bronze body and seat resist corrosion in potable water systems
  • Low 0.750–1.000 psi cracking pressure opens with minimal flow
  • Rated to 250 psi at 150 °F for reliable high-pressure service
  • Operates from -20 °F to 353 °F across heating and cooling circuits

Spring check valve for 1 1/2 inch piping

The Milwaukee Valve UP548T is a bronze inline spring check valve with FNPT threaded connections on both ends. It is built for water lines operating up to 250 psi at 150 degrees Fahrenheit and handles temperatures from -20 to 353 degrees Fahrenheit. The valve suits residential and light commercial bath plumbing where a compact, threaded non-return device is required.

Low cracking pressure and horizontal mounting

A cracking pressure between .750 and 1.000 psi lets the valve open with minimal flow, reducing head loss in gravity-fed or low-pressure circuits. The bronze body, seat and spring resist corrosion while the inline spring design keeps the mechanism simple for horizontal installations. Continuous operation at the rated 250 psi and 150 degrees Fahrenheit stays within the published limits without steam service.

Replaces worn bronze check valves in bath systems

This unit replaces failed or leaking bronze check valves of the same 1 1/2 inch FNPT size and pressure class. The jump is worthwhile when the existing valve no longer seals at low pressure or when the spring has fatigued after repeated cycling. It is not for steam lines, vertical-only mounting or applications needing a higher cracking pressure than 1.000 psi.

Highlights

  • Spring-loaded inline design prevents backflow automatically
  • Bronze body and seat resist corrosion in potable water systems
  • Low 0.750–1.000 psi cracking pressure opens with minimal flow
  • Rated to 250 psi at 150 °F for reliable high-pressure service
  • Operates from -20 °F to 353 °F across heating and cooling circuits

Specifications

BrandMILWAUKEE VALVE
TypeOther

Questions about this item

How much heat can the bronze spring check valve handle when running continuously?

The valve is rated for a maximum temperature of 353 degrees F, so it will tolerate sustained hot-water circulation at that level.

What piping must already be in place for the FNPT threaded connections to seal?

You need 1 1/2 inch female NPT threads on both the supply and return lines to mate with the valve ends.

Will the 0.750 to 1.000 psi cracking pressure work with an older low-pressure gravity system?

Yes, the low cracking pressure range allows the spring to open under the minimal head pressure typical of older gravity-fed installations.

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