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Brass water pressure reducing valve with union connections, 1/2 inch NPT

Watts

Watts 1/2 LF N55BUM1 Water Pressure Reducing Valve

SKU CH-KMT9-HXYWR

Lead-free brass valve with integral strainer reduces inlet pressure to a 25–75 psi adjustable range, factory-set at 50 psi

  • TypeTraffic & Parking Lot
  • Preset to 50 psi for immediate balanced pressure
  • Adjustable 25 to 75 psi range suits varied supply conditions
  • Lead-free brass body meets NSF/ANSI 61-8 for safe potable water
  • Built-in strainer traps debris to protect downstream fixtures
  • Rated to 400 psi and 160 °F for durable service

Lead-Free Brass Pressure Reducing Valve

The Watts LF N55BUM1 reduces incoming water pressure to a preset 50 psi to protect downstream plumbing fixtures. It fits 1/2 inch NPT union by FNPT connections and includes an integrated strainer. Lead-free brass construction meets NSF/ANSI 61-8 for potable water safety. Homeowners and plumbers use it on residential supply lines where code requires pressure control.

Adjustment Range 25 to 75 psi

The valve adjusts from 25 psi to 75 psi so installers can match local pressure requirements. Maximum rated inlet pressure is 400 psi and maximum operating temperature is 160 degrees F. Certified to ASSE 1003, ANSI A112.26.2 and CSA B356 for pressure-reducing valve performance. Buyers who need a wider adjustment span or higher temperature rating must select a different valve model.

1/2 Inch NPT Union Connection

The 1/2 inch NPT union by FNPT connection determines whether this valve fits the existing piping without adapters. Overall height is 6 inches and length is 5-1/8 inches for space planning in tight mechanical rooms. Verify the pipe size and thread type before ordering to avoid mismatched fittings.

Highlights

  • Preset to 50 psi for immediate balanced pressure
  • Adjustable 25 to 75 psi range suits varied supply conditions
  • Lead-free brass body meets NSF/ANSI 61-8 for safe potable water
  • Built-in strainer traps debris to protect downstream fixtures
  • Rated to 400 psi and 160 °F for durable service

Specifications

BrandWATTS
TypeTraffic & Parking Lot

Questions about this item

Should I choose the 25 psi or 75 psi end of the adjustment range for my home?

The valve is preset at 50 psi and adjusts from 25 to 75 psi; start at the factory setting and turn the adjustment screw only if your fixtures need lower or higher pressure.

What does the 50 psi preset mean once the valve is installed?

Out of the box the valve will deliver approximately 50 psi downstream regardless of inlet pressure up to 400 psi, protecting pipes and appliances from excess pressure.

The valve meets ASSE 1003 and NSF 61-8 — what do those standards cap in practice?

ASSE 1003 certifies pressure-reducing performance for water distribution, and NSF/ANSI 61-8 confirms the lead-free brass is safe for potable water contact.

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