Uponor LF4525075 Male Adapter 1/2 X 3/4 in Pex X Mnpt Brass

Product Description

The UPONOR LF4525075 is a lead-free brass male adapter designed to transition between PEX tubing and male NPT threaded pipe connections. It accepts a 1/2-inch PEX fitting connection on one end and terminates with a 3/4-inch male NPT thread on the other, making it a cross-size transition fitting suited for potable water and hydronic plumbing systems. The lead-free brass construction meets drinking water compliance requirements. Licensed plumbers install this fitting in residential and light commercial applications wherever PEX distribution lines must connect to threaded metal components such as shutoff valves, manifold ports, or fixture supply stubs.

This adapter is used in PEX-based domestic water distribution systems, including cold and hot supply lines. The PEX end is compatible with Uponor ProPEX or applicable expansion-style connection systems depending on system design. The 3/4-inch MNPT outlet allows direct threading into female-threaded valves, tees, or transition fittings. Typical install scenarios include connecting PEX branch lines to threaded valve bodies, water heater connections, or manifold outlets where a size step-up from 1/2 inch to 3/4 inch NPT is required.

Key Features

• Lead-free brass construction meets federal and state drinking water regulations
• 1/2-inch PEX inlet to 3/4-inch MNPT outlet provides cross-size transition capability
• Brass body offers corrosion resistance suitable for potable water and hydronic service
• Domestically sourced fitting for projects requiring domestic-origin materials
• Male NPT thread allows direct connection to standard female-threaded fittings and valves

Compatibility

Designed as an OEM-style transition fitting for PEX plumbing systems requiring a 1/2-inch PEX to 3/4-inch male NPT connection. Confirm PEX connection method compatibility with your specific Uponor system before installation.

Installation Notes

Installation should be performed by a licensed plumber in accordance with local plumbing codes and the IPC. Shut off the water supply and depressurize the line before making any connections. Apply an approved thread sealant or PTFE tape to the male NPT threads before threading into the female fitting — do not overtighten, as brass threads can be damaged by excessive torque. Verify that the PEX connection method used is appropriate for the specific Uponor fitting system installed.

Technical Specifications

• Inlet Size: 1/2 inch (PEX)
• Outlet Size: 3/4 inch (MNPT)
• Connection Type: PEX x Male NPT
• Material: Brass
• Lead-Free: Yes
• Origin: Domestic

Standard Information

• Brand: UPONOR
• Manufacturer Part Number: LF4525075