Legend Valve 301-303 Dielectric Union 1/2 Inch

Product Description

The LEGEND VALVE 301-303 is a 1/2 inch dielectric union designed to isolate dissimilar metals in plumbing systems, preventing galvanic corrosion at pipe connections. Dielectric unions are installed where copper and steel pipe meet, breaking the electrical path that would otherwise cause accelerated pipe degradation. This fitting is a standard component in residential and light commercial water supply systems. Licensed plumbers install this union during new construction and retrofit work wherever code or system design requires isolation between unlike metals.

The 301-303 is suited for 1/2 inch water supply lines in residential and light commercial applications. Typical installation points include water heater connections, boiler supply and return lines, and any transition from copper tubing to threaded steel or galvanized pipe. The 1/2 inch size covers the most common supply branch line dimension found in residential plumbing.

Key Features

• Dielectric isolation prevents galvanic corrosion at dissimilar metal joints
• 1/2 inch connection size fits standard residential supply branch lines
• Union design allows future disconnection without cutting pipe
• T-572 series construction suitable for water supply service

Compatibility

Designed as an OEM-style replacement or new-installation dielectric union for 1/2 inch water supply piping systems where copper-to-steel transitions require galvanic isolation.

Installation Notes

Installation should be performed by a licensed plumber in accordance with the applicable version of the International Plumbing Code. Shut off the water supply and relieve system pressure before disassembling any existing union or fitting. Do not overtighten the union nut, as excess torque can crack the dielectric sleeve and defeat the isolation function. Inspect the dielectric insert and washer for damage before assembly.

Technical Specifications

• Connection Size: 1/2 inch
• Series: T-572
• UPC: 662545010908

Standard Information

• Brand: LEGEND VALVE
• Manufacturer Part Number: 301-303