Watts 821786 Lead Free Dielectric Union 0.5 in Ips Black

Product Description

The WATTS 821786 is a lead-free dielectric union designed to stop galvanic corrosion and stray current deterioration in piping systems where dissimilar metals meet. Rated to 180 degrees F and 250 psi, this 0.5 inch IPS union features female iron pipe thread connections on both ends with a black finish. It includes a union nut, two tailpieces, and a Buna-N gasket that electrically isolates the tailpieces to interrupt current flow. Licensed plumbers install this fitting in new construction and retrofit service calls as a code-compliant solution for mixed-metal piping systems.

The 821786 is suited for both residential and commercial plumbing applications where copper, galvanized steel, or other dissimilar metal pipes are joined. Common installation points include hot water storage tanks, water heaters, water and air conditioning systems, processing tanks, and steam, gas, and water distribution piping. Its lead-free construction satisfies safe drinking water standards and makes it appropriate for potable water service lines as well as non-potable mechanical systems.

Key Features

• Lead-free construction compliant with safe drinking water requirements
• Buna-N gasket electrically isolates tailpieces to prevent galvanic and stray current corrosion
• Rated to 180 degrees F and 250 psi for broad system compatibility
• Female iron pipe thread on both ends with black finish for iron and steel pipe connections
• Includes union nut and two tailpieces for a complete assembly
• Suitable for steam, gas, and water piping as well as storage tank connections

Compatibility

Designed for 0.5 inch IPS female iron pipe thread connections in residential and commercial plumbing systems including hot water storage tanks, water and air conditioning equipment, processing tanks, and steam, gas, and water piping where dissimilar metals are joined.

Installation Notes

Installation is typically performed by a licensed plumber in accordance with local plumbing codes and IPC requirements. Shut off the water supply and relieve system pressure before disassembling any fittings. Apply thread sealant or PTFE tape to all pipe threads and hand-tighten before using pipe wrenches to achieve a leak-free joint. Do not overtighten the union nut, as excessive force can damage the Buna-N gasket and compromise electrical isolation.

Technical Specifications

• Connection Type: Female Iron Pipe Thread x Female Iron Pipe Thread (FIP x FIP)
• Pipe Size: 0.5 inches IPS
• Finish: Black
• Gasket Material: Buna-N
• Maximum Temperature: 180 degrees F (82 degrees C)
• Maximum Pressure: 250 psi (17.2 bar)
• Lead Free: Yes

Standard Information

• Brand: WATTS
• Manufacturer Part Number: 821786