Watts 0009865 Union

The Watts 0009865 (Series LF3001A) is a professional-grade 3/4 inch dielectric union designed to transition between dissimilar piping materials while eliminating the risk of galvanic corrosion. This lead free replacement for the legacy 0821405 model provides a reliable FPT x Solder connection, making it an essential component for contractors installing water heaters, storage tanks, and HVAC systems. By utilizing a Buna-N gasket and a high-strength polysulfone insulator, this union effectively breaks the electrical path between joined metals such as iron and copper, shielding the system from destructive stray currents.

Engineered for high-performance mechanical environments, the Watts LF3001A-3/4 maintains a maximum pressure of 250 psi and is rated for operating temperatures up to 180°F. The robust steel nut and tailpiece construction ensure high tensile strength and long-term joint integrity in both residential and commercial plumbing and heating applications. For technicians updating older systems, this 3/4" female iron pipe thread to copper solder fitting ensures code compliance and protects against the premature oxidation typically found at mixed-metal junctions.

Key Benefits

• Prevents Galvanic Corrosion: Effectively separates dissimilar metals to stop electrolysis and extend the service life of piping systems.
• Lead Free Construction: Fully compliant with modern safety requirements for potable water and food service applications.
• High Dielectric Strength: Factory-tested to withstand up to 600 volts on a dry line with no flashover.
• Versatile Compatibility: Ideal for hot water storage tanks, air conditioning water lines, and steam or gas piping.
• Durable Sealing: Features a standard Buna-N gasket specifically designed for water and air applications up to 180°F.

Common Questions

Which pipes require a dielectric union?
Technicians must use a dielectric union whenever joining a copper pipe to a galvanized steel or iron pipe to prevent the copper from causing the steel to corrode rapidly via galvanic action.

Is the Watts 0009865 the correct sub for the 0821405?
Yes, the 0009865 is the upgraded lead free version of the 0821405. It maintains the same 3/4" FPT x 3/4" Sweat dimensions for a direct drop-in replacement.

Can I use this union for high-temperature steam?
The standard 0009865 is rated up to 180°F at 250 psi. For steam applications up to 300°F, an optional EPDM gasket (Gasket B) is required, which adjusts the pressure rating to 50 psi.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.