Watts Temperature and Pressure Relief Valve: Section IV ASME Section, MNPT x FNPT
The WATTS Temperature and Pressure Relief Valve is an ASME Section IV valve with a brass body, available in MNPT x FNPT connections (MPN LLL100XL). This product is designed for temperature and pressure relief…
SKU 3G-OTH-437141
Need installation or engineering help?
Ask a question
Product Description
The WATTS Temperature and Pressure Relief Valve is an ASME Section IV valve with a brass body, available in MNPT x FNPT connections (MPN LLL100XL). This product is designed for temperature and pressure relief applications in accordance with Section IV of the ASME code.
Frequently Asked Questions
What is the WATTS LLL100XL temperature and pressure relief valve used for?
The WATTS LLL100XL is an ASME Section IV temperature and pressure relief valve designed to protect water heaters and boilers from excessive temperature or pressure. It automatically opens to discharge water when unsafe conditions occur, preventing equipment damage or failure in commercial and industrial hot-water systems.
What are the specifications of the WATTS LLL100XL valve?
The WATTS LLL100XL is a brass-bodied temperature and pressure relief valve with MNPT x FNPT connections. It complies with ASME Section IV standards. The manufacturer part number is LLL100XL, and the body material is brass. This valve is suitable for use in hot-water heating systems requiring ASME-rated overpressure protection.
Where to buy the WATTS LLL100XL valve worldwide?
You can source the WATTS LLL100XL temperature and pressure relief valve through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time; we supply genuine WATTS components for commercial and industrial applications.
How to install the WATTS LLL100XL temperature and pressure relief valve?
Install the WATTS LLL100XL valve in the designated tapping of the water heater or boiler, ensuring the discharge pipe is directed safely to a drain. Use thread sealant on the MNPT connections and avoid overtightening. The valve must be oriented per ASME guidelines to allow proper sensing of temperature and pressure. Always follow local plumbing codes.
Used in
Common applications for WattsWatts Products
3G Electric supplies Watts asme section iv temperature & pressure relief valves. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.















