Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
RFQ CartGet a QuoteSign inSign up
Watts Temperature and Pressure Relief Valve: Section IV ASME Section, MNPT x FNPT - ASME Section IV Temperature & Pressure Relief Valves
WattsASME Section IV Temperature & Pressure Relief Valves

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 constructed with a brass body. This model, MPN 3/4 LF LLL100XL-2, features MNPT x FNPT connections. It is designed for temperature and…

SKU 3G-OTH-437109

Brand
Watts
Item
Temperature and Pressure Relief Valve: Section IV ASME Section, MNPT x FNPT
Category
ASME Section IV Temperature & Pressure Relief Valves
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Technical Specifications

Watts
Manufacturer Part Number
3/4 LF LLL100XL-2
Type
MNPT x FNPT, Brass
Body Material
Brass
View Full Spec Sheet

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

Watts Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The WATTS Temperature and Pressure Relief Valve is an ASME Section IV valve constructed with a brass body. This model, MPN 3/4 LF LLL100XL-2, features MNPT x FNPT connections. It is designed for temperature and pressure relief applications in accordance with Section IV of the ASME code.

Frequently Asked Questions

What is the WATTS Temperature and Pressure Relief Valve used for?

The WATTS Temperature and Pressure Relief Valve is used in hot water heating systems and storage tanks to automatically relieve excess temperature or pressure, preventing equipment damage or explosion. It complies with ASME Section IV standards for safety in commercial and residential applications.

What are the specifications of the WATTS 3/4 LF LLL100XL-2 valve?

The WATTS 3/4 LF LLL100XL-2 is an ASME Section IV temperature and pressure relief valve with a brass body. It has MNPT x FNPT connections and is manufactured by WATTS. The valve is designed for reliable overpressure and overtemperature protection in hydronic systems.

Where to buy the WATTS 3/4 LF LLL100XL-2 valve worldwide?

You can source the WATTS 3/4 LF LLL100XL-2 valve worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time.

How to install a WATTS temperature and pressure relief valve?

Install the WATTS valve in the tank or system tapping, ensuring the sensing element extends into the water. Orient the discharge piping downward, with no shutoff valves, and terminate near a floor drain. Follow local codes and the manufacturer's instructions for safe operation.

Used in

Common applications for Watts
Industrial burner gas safety systems — Watts HF2000 filters with GF-series seal kits maintain clean, regulated gas supply to burner pilot and main flame controls
Commercial heating and boiler installations — Modular filter assemblies support preventive maintenance and component replacement without full system shutdown
Process gas delivery pipelines — DN25 through DN125 filter bodies accommodate varying flow rates and inlet pressures across manufacturing and chemical processes
Gas pressure regulation benches — Multi-stage Watts filter platforms integrate with pressure reducers and safety shutoff valves in test and calibration environments
Equipment retrofit and upgrade projects — Available connection sizes and seal kits enable adaptation of newer Watts components into legacy gas control systems
Planned maintenance and spare-parts inventory — Filter seal kits allow facilities to stock consumables in advance, reducing downtime during scheduled gas system servicing

Watts 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.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Similar products

Matched by specification & description
WATTS Temperature and Pressure Relief Valve: Section IV ASME Section, MNPT x FNPT, Brass (MPN LLL100XL). Key specifications — Brand: WATTS; Body Material: Brass.
Watts
WATTS Temperature and Pressure Relief Valve: Section IV ASME Section, MNPT x FNPT, Brass (MPN LLL100XL). Key specifications — Brand: WATTS; Body Material: Brass.
WATTS Temperature and Pressure Relief Valve: Section IV ASME Section, MNPT x FNPT, Brass (MPN L100XL-3). Key specifications — Brand: WATTS; Body Material: Brass.
Watts
WATTS Temperature and Pressure Relief Valve: Section IV ASME Section, MNPT x FNPT, Brass (MPN L100XL-3). Key specifications — Brand: WATTS; Body Material: Brass.
WATTS Temperature and Pressure Relief Valve: Section IV ASME Section, MNPT x FNPT, Brass (MPN LL100XL). Key specifications — Brand: WATTS; Body Material: Brass.
Watts
WATTS Temperature and Pressure Relief Valve: Section IV ASME Section, MNPT x FNPT, Brass (MPN LL100XL). Key specifications — Brand: WATTS; Body Material: Brass.
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size, Brass (MPN 3/4 100XL-075210). Key specifications — Brand: WATTS; Body Material: Brass.
Watts
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size, Brass (MPN 3/4 100XL-075210). Key specifications — Brand: WATTS; Body Material: Brass.
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size (MPN 3/4 LF100XL8-150/210). Key specifications — Brand: WATTS; Body Material: Copper Silicon Alloy.
Watts
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size (MPN 3/4 LF100XL8-150/210). Key specifications — Brand: WATTS; Body Material: Copper Silicon Alloy.
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size, Brass (MPN 3/4 100XL-175/210). Key specifications — Brand: WATTS; Body Material: Brass.
Watts
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size, Brass (MPN 3/4 100XL-175/210). Key specifications — Brand: WATTS; Body Material: Brass.

More from Watts

View all Watts parts →
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size, Brass (MPN 3/4 100XL-100210). Key specifications — Brand: WATTS; Body Material: Brass.
Watts
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size, Brass (MPN 3/4 100XL-100210). Key specifications — Brand: WATTS; Body Material: Brass.
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size, Brass (MPN 100XL-4). Key specifications — Brand: WATTS; Body Material: Brass.
Watts
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size, Brass (MPN 100XL-4). Key specifications — Brand: WATTS; Body Material: Brass.
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size, Brass (MPN 3/4 LF 100XL-4). Key specifications — Brand: WATTS; Body Material: Brass.
Watts
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size, Brass (MPN 3/4 LF 100XL-4). Key specifications — Brand: WATTS; Body Material: Brass.
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size (MPN 3/4 LF100XL 125-210). Key specifications — Brand: WATTS; Body Material: Copper Silicon Alloy.
Watts
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size (MPN 3/4 LF100XL 125-210). Key specifications — Brand: WATTS; Body Material: Copper Silicon Alloy.
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size (MPN LF100XL-4 M7). Key specifications — Brand: WATTS; Body Material: Copper Silicon Alloy.
Watts
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size (MPN LF100XL-4 M7). Key specifications — Brand: WATTS; Body Material: Copper Silicon Alloy.
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size (MPN 3/4 LF100XL 175-210). Key specifications — Brand: WATTS; Body Material: Copper Silicon Alloy.
Watts
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size (MPN 3/4 LF100XL 175-210). Key specifications — Brand: WATTS; Body Material: Copper Silicon Alloy.
WATTS Temperature and Pressure Relief Valve: Section IV ASME Section, MNPT x FNPT, Bronze (MPN F163725). Key specifications — Brand: WATTS; Body Material: Bronze.
Watts
WATTS Temperature and Pressure Relief Valve: Section IV ASME Section, MNPT x FNPT, Bronze (MPN F163725). Key specifications — Brand: WATTS; Body Material: Bronze.
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size (MPN 3/4 LF L100XL 150-210). Key specifications — Brand: WATTS; Body Material: Copper Silicon Alloy.
Watts
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size (MPN 3/4 LF L100XL 150-210). Key specifications — Brand: WATTS; Body Material: Copper Silicon Alloy.