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Brass water pressure reducing valve with double union and PEX connections

Watts Regulator Company

Watts Regulator Company 1" LFN55BM1-DU-PEX Water Pressure Reducing Valve

SKU CH-9D9Q-RB7QR

Reduces incoming water pressure to a preset 50 psi, adjustable from 25 to 75 psi, with a lead-free copper silicon alloy body and double union PEX connections

  • TypeTraffic & Parking Lot
  • Lead-free alloy keeps drinking water safe
  • Preset at 50 psi for quick commissioning
  • Adjustable 25 to 75 psi suits varied demands
  • Double union PEX connection speeds installation
  • Certified to ASSE 1003 and CSA B356 standards

What the valve does and who installs it

The Watts Regulator Company LFN55BM1-DU-PEX is a lead-free water pressure reducing valve designed for residential and light-commercial plumbing systems. It protects downstream fixtures by lowering incoming supply pressure to a safer, preset level. Professional plumbers and experienced DIYers use it where municipal pressure exceeds fixture ratings. It is not for buyers who need a valve without an integrated strainer.

How it fits into a plumbing system

The valve connects via a double-union by PEX-union configuration on a one-inch line, allowing straightforward installation and service without cutting pipe. Its built-in strainer captures debris that could damage seats or downstream components, freeing the installer from adding a separate filter body. The 5-1/4 inch length and 6-1/4 inch height suit standard rough-in cavities. It is not for systems that require a flanged or threaded-only connection.

Temperature, pressure and noise in service

The brass-alloy body handles water temperatures up to 180 degrees Fahrenheit and a maximum inlet pressure of 400 psi. Outlet pressure is factory preset at 50 psi and can be adjusted between 25 and 75 psi to match site requirements. Compliance with ASSE 1003, ANSI A112.26.2 and CSA B356 confirms performance under normal flow conditions. It is not for steam service or applications exceeding the rated temperature.

Highlights

  • Lead-free alloy keeps drinking water safe
  • Preset at 50 psi for quick commissioning
  • Adjustable 25 to 75 psi suits varied demands
  • Double union PEX connection speeds installation
  • Certified to ASSE 1003 and CSA B356 standards

Specifications

BrandWATTS REGULATOR
TypeTraffic & Parking Lot

Questions about this item

What is the maximum water temperature the 1" LFN55BM1-DU-PEX valve can handle before performance degrades?

The valve is rated for a maximum temperature of 180 degrees Fahrenheit, which is the upper limit for sustained hot water use.

How much noise or heat does the valve generate during continuous operation?

As a passive mechanical regulator with no moving electrical parts, it produces no operational noise or heat beyond the water temperature itself.

What pipe fittings or tools must I already have to install this double union PEX valve?

You need 1-inch PEX tubing, compatible crimp or expansion rings, and the appropriate crimping or expansion tool for the connection type.

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