Watts 390 805 O-ring Seal

Product Description

The WATTS 390 805 is a replacement O-ring seal designed for use in plumbing and hydronic system assemblies where a reliable fluid-tight connection is required. O-rings of this type serve as static or dynamic seals between mating components, preventing leaks at joints, valve bodies, and threaded or flanged connections. This part is installed by licensed plumbers and mechanical contractors during routine maintenance, repair, or component replacement procedures. Its compact elastomeric construction is suited for sealing applications where system integrity is critical to performance.

This O-ring is applicable to residential and light commercial plumbing systems, hydronic heating assemblies, and valve service work. It is used during scheduled maintenance or emergency repair situations where the original seal has worn, cracked, or deformed. Technicians working on pressure-reducing valves, backflow preventers, or similar WATTS equipment will find this seal appropriate for service procedures requiring original-equipment-style replacement parts.

Key Features

• Elastomeric O-ring construction provides a fluid-tight static or dynamic seal
• Designed as a direct OEM-style replacement for compatible WATTS assemblies
• Compact form factor suited for valve body and fitting service applications
• Resists deformation under typical plumbing system operating pressures

Compatibility

Designed as an OEM-style replacement O-ring seal for compatible WATTS plumbing and valve assemblies requiring this seal specification.

Installation Notes

Installation should be performed by a licensed plumber or qualified mechanical technician. Shut off the water supply and depressurize the system before removing any components. Inspect the mating sealing surfaces for damage or debris before seating the new O-ring. Follow applicable plumbing codes, including IPC guidelines, for pressure system service and reassembly.

Technical Specifications

• Component Type: O-Ring Seal

Standard Information

• Brand: WATTS
• Manufacturer Part Number: 390 805