Ao Smith 100112255 Isolation Pressure Relief Valve 1in Fnpt

Product Description

The AO SMITH 100112255 is a lead-free isolation pressure relief valve designed for tankless water heater and hot water system service applications. The valve serves a dual purpose: isolating the unit during service procedures and protecting the system by releasing pressure when system pressure exceeds 150 psi. The 1-inch FNPT union x FNPT union connection provides a secure threaded fit at both ends. Lead-free construction meets current plumbing code requirements for potable water systems. This valve is installed by licensed plumbers and qualified service technicians working on tankless water heating equipment.

This isolation pressure relief valve is suited for residential and light commercial tankless water heater installations where service isolation and overpressure protection are required. It is specifically noted for use with the Takagi T-M50 and T-M50-ASME tankless water heaters. The 1-inch female NPT union connections on both ends allow the valve to be installed in-line with the water supply or outlet piping of the heater, enabling the unit to be isolated from the system for maintenance or replacement without draining the entire plumbing loop.

Key Features

• Pressure relief activates when system pressure exceeds 150 psi, protecting the water heater and connected piping
• Isolation function allows service technicians to isolate the unit without shutting down the full system
• 1-inch FNPT union x FNPT union connection for straightforward in-line installation
• Lead-free construction compliant with potable water plumbing regulations
• Designed specifically for tankless water heater applications

Compatibility

Designed for use with the Takagi T-M50 and T-M50-ASME tankless water heaters. Verify connection size and pressure rating against the specific installation requirements before ordering.

Installation Notes

Installation should be performed by a licensed plumber in accordance with local plumbing codes and the International Plumbing Code (IPC). Shut off the water supply and relieve system pressure before removing or installing any valve components. Do not over-tighten threaded NPT connections; use appropriate thread sealant rated for hot water service. Verify that the relief valve discharge is piped to a safe drain location per the water heater manufacturer instructions and applicable code.

Technical Specifications

• Connection Type: FNPT Union x FNPT Union
• Thread Size: 1 inch
• Thread Type: Female NPT
• Relief Pressure: 150 psi
• Lead Free: Yes

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100112255