Description
The Watts F121430 is a 3/4-inch lead-free temperature and pressure (T&P) relief valve engineered to deliver dependable overpressure and overtemperature protection for residential and commercial water heating systems. Carrying the model designation LFLLL40XL150, this valve is rated at an impressive 1,437,000 BTU, making it suitable for high-demand water heater applications where safety and code compliance are paramount.
Key Features
- Lead-free (LF) construction for compliance with NSF/ANSI 61 and low-lead plumbing code requirements
- 3/4-inch connection size for straightforward installation on standard water heater ports
- High BTU rating of 1,437,000 BTU to handle large-capacity water heating equipment
- Temperature and pressure relief in a single valve for dual-mode overpressure protection
- Designed to meet ASME, ANSI, and CSA safety standards for T&P relief valves
- Automatic discharge action activates when temperature or pressure exceeds safe operating thresholds
- Durable valve body construction for long service life in demanding hydronic and plumbing environments
Application
The Watts LFLLL40XL150 T&P relief valve is ideal for use on residential and light commercial water heaters, storage tanks, and hydronic boilers where a 3/4-inch relief port is specified. Its high BTU capacity ensures it can serve larger water heaters and storage systems without compromising safety performance.
Why Choose Watts T&P Relief Valves
Watts is a globally recognized leader in flow control and water quality products. Their lead-free T&P relief valves are trusted by plumbing and HVAC professionals for consistent performance, code compliance, and long-term reliability. The LF designation ensures this valve meets the strict lead-content requirements mandated by the Safe Drinking Water Act and applicable state plumbing codes.
Specifications
- Brand: Watts
- SKU / Part Number: F121430
- Model: LFLLL40XL150
- Connection Size: 3/4 inch
- BTU Rating: 1,437,000 BTU
- Valve Type: Temperature & Pressure (T&P) Relief Valve
- Construction: Lead-Free (LF)







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