Description
Overview
The Watts F121429 LFLL40XL-4 is a 3/4″ lead-free automatic reseating temperature and pressure relief valve engineered for reliable protection of water heaters and hydronic heating systems. Rated at 150 psi and 210°F, this valve automatically opens to release excess pressure or temperature and reseats cleanly once safe operating conditions are restored — minimizing system downtime and the need for manual intervention.
Key Features
- Lead-free construction for compliance with safe drinking water regulations
- Automatic reseating design — resets without manual replacement after actuation
- 3/4″ valve connection for standard water heater and hydronic applications
- Maximum pressure rating: 150 psi
- Maximum temperature rating: 210°F
- 4″ coated thermostat element for accurate temperature sensing
- Discharge line flood sensor included for added leak detection and system protection
Lead-Free Compliance
Built to meet lead-free requirements under the Safe Drinking Water Act, the LFLL40XL-4 is suitable for potable water systems where compliance with low-lead content standards is mandatory.
Flood Sensor Protection
The included discharge line flood sensor provides an additional layer of protection by detecting water discharge at the relief valve outlet — alerting building owners or facility managers to potential over-temperature or over-pressure events before they escalate.
Specifications
- SKU: F121429
- Model: LFLL40XL-4
- Brand: Watts
- Connection Size: 3/4″
- Pressure Rating: 150 psi
- Temperature Rating: 210°F
- Thermostat Length: 4″ coated
- Lead-Free: Yes
- Flood Sensor: Included (discharge line)
- Reseating Type: Automatic
Applications
- Residential and light commercial water heaters
- Hydronic boilers and heating systems
- Potable water systems requiring lead-free components
- Any pressurized vessel requiring ASME-style T&P overpressure protection
Reviews
There are no reviews yet.