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 3/4 100XL 125 ASME Section IV Temperature & Pressure Relief Valve - ASME Section IV Temperature & Pressure Relief Valves
WattsASME Section IV Temperature & Pressure Relief Valves

Watts 3/4 100XL 125 ASME Section IV Temperature & Pressure Relief Valve

The WATTS Temperature and Pressure Relief Valve (SKU 3G-OTH-437106) is an ASME Section IV temperature and pressure relief valve with a brass body. It features a 3/4 in MNPT x 3/4 in FNPT connection size and is…

SKU 3G-OTH-437106

Also listed as: 34100XL125 · 3 4 100XL 125 · 3-4-100XL-125

Brand
Watts
Item
3/4 100XL 125 ASME Section IV Temperature & Pressure Relief Valve
Category
ASME Section IV Temperature & Pressure Relief Valves
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
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

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

Watts
Manufacturer Part Number
3/4 100XL 125
Type
Brass
Body Material
Brass
Connection Size
3/4 in x 3/4 in

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 (SKU 3G-OTH-437106) is an ASME Section IV temperature and pressure relief valve with a brass body. It features a 3/4 in MNPT x 3/4 in FNPT connection size and is identified by manufacturer part number 3/4 100XL 125.

Frequently Asked Questions

What is the WATTS 3/4 100XL 125 temperature and pressure relief valve used for?

This ASME Section IV valve protects water heaters and storage tanks from excessive temperature or pressure. It automatically opens to relieve steam or water when internal conditions exceed safe limits, preventing catastrophic failures in residential and commercial hydronic systems.

What are the specifications of the WATTS 3/4 100XL 125 valve?

The valve has a brass body with 3/4 in MNPT x 3/4 in FNPT connections. It is an ASME Section IV temperature and pressure relief valve, manufactured by WATTS under part number 3/4 100XL 125. The SKU is 3G-OTH-437106.

Where to buy the WATTS 3/4 100XL 125 valve worldwide?

3G Electric supplies the WATTS 3/4 100XL 125 valve worldwide. As a global industrial distributor, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time.

How to install a WATTS temperature and pressure relief valve?

Install the valve in the tank's designated T&P port with the sensing element immersed. Use thread sealant on the 3/4 in MNPT connection. Route the discharge pipe downward, terminating 6-12 inches above a floor drain. Never cap or plug the outlet.

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 →

Compatible alternatives & equivalents

Cross-referenced by specification & description
Brass-bodied temperature and pressure relief valve with 3/4 in male NPT inlet and 3/4 in female NPT outlet. ASME Section IV rated for use on water heaters and storage tanks to automatically relieve excess temperature or pressure
Watts
Brass-bodied temperature and pressure relief valve with 3/4 in male NPT inlet and 3/4 in female NPT outlet. ASME Section IV rated for use on water heaters and storage tanks to automatically relieve excess temperature or pressure
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size, Brass (MPN 3/4 100XL-100210)
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)
Brass temperature and pressure relief valve with 3/4 in MNPT inlet and 3/4 in FNPT outlet. ASME Section IV rated for use on hot water storage tanks and heating boilers to relieve excess temperature or pressure
Watts
Brass temperature and pressure relief valve with 3/4 in MNPT inlet and 3/4 in FNPT outlet. ASME Section IV rated for use on hot water storage tanks and heating boilers to relieve excess temperature or pressure
This ASME Section IV temperature and pressure relief valve is designed for use on hot water storage tanks and boilers. It automatically opens to discharge water when internal temperature or pressure exceeds safe limits. The valve features a brass body with 3/4 in male NPT inlet and 3/4 in female NPT outlet connections
Watts
This ASME Section IV temperature and pressure relief valve is designed for use on hot water storage tanks and boilers. It automatically opens to discharge water when internal temperature or pressure exceeds safe limits. The valve features a brass body with 3/4 in male NPT inlet and 3/4 in female NPT outlet connections
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size, Brass (MPN 100XL-4)
Watts
WATTS Temperature and Pressure Relief Valve: MNPT x FNPT, 3/4 in x 3/4 in Connection Size, Brass (MPN 100XL-4)
This ASME Section IV rated hot water pressure relief valve features a copper silicon alloy body with 3/4 in FNPT x 3/4 in FNPT connections and an overall height of 4 1/2 in. It is designed to automatically release water when pressure exceeds safe limits, protecting water heaters and boilers in hydronic heating systems
Watts
This ASME Section IV rated hot water pressure relief valve features a copper silicon alloy body with 3/4 in FNPT x 3/4 in FNPT connections and an overall height of 4 1/2 in. It is designed to automatically release water when pressure exceeds safe limits, protecting water heaters and boilers in hydronic heating systems

More from Watts

View all Watts parts →
This ASME Section IV rated temperature and pressure relief valve features a brass body with 3/4 in male NPT inlet and 3/4 in female NPT outlet connections. It automatically opens to relieve excess temperature or pressure in water heaters and storage tanks, helping prevent system failure. Suitable for use in hot water systems
Watts
This ASME Section IV rated temperature and pressure relief valve features a brass body with 3/4 in male NPT inlet and 3/4 in female NPT outlet connections. It automatically opens to relieve excess temperature or pressure in water heaters and storage tanks, helping prevent system failure. Suitable for use in hot water systems
ASME Section IV temperature and pressure relief valve with 3/4 in MNPT x 3/4 in FNPT connections. Body constructed of copper silicon alloy. Used to protect hot water heaters and storage tanks from overpressure and overtemperature conditions
Watts
ASME Section IV temperature and pressure relief valve with 3/4 in MNPT x 3/4 in FNPT connections. Body constructed of copper silicon alloy. Used to protect hot water heaters and storage tanks from overpressure and overtemperature conditions
ASME Section IV temperature and pressure relief valve with 3/4 in MNPT x 3/4 in FNPT connections. Body constructed of copper silicon alloy. Automatically opens to discharge water when temperature or pressure exceeds safe limits, protecting water heaters and storage tanks
Watts
ASME Section IV temperature and pressure relief valve with 3/4 in MNPT x 3/4 in FNPT connections. Body constructed of copper silicon alloy. Automatically opens to discharge water when temperature or pressure exceeds safe limits, protecting water heaters and storage tanks
Copper silicon alloy body temperature and pressure relief valve with 3/4 in MNPT x 3/4 in FNPT connections. ASME Section IV rated for use on hot water storage tanks and boilers to automatically relieve excess temperature or pressure
Watts
Copper silicon alloy body temperature and pressure relief valve with 3/4 in MNPT x 3/4 in FNPT connections. ASME Section IV rated for use on hot water storage tanks and boilers to automatically relieve excess temperature or pressure
This bronze-bodied temperature and pressure relief valve is rated to ASME Section IV standards. It features male NPT by female NPT connections and is used to protect hot water heating systems and storage tanks from excessive temperature or pressure
Watts
This bronze-bodied temperature and pressure relief valve is rated to ASME Section IV standards. It features male NPT by female NPT connections and is used to protect hot water heating systems and storage tanks from excessive temperature or pressure
This ASME Section IV temperature and pressure relief valve is constructed with a copper silicon alloy body. It features a 3/4 in male NPT inlet and a 3/4 in female NPT outlet. Used as a safety device on hot water heating boilers and storage tanks to automatically relieve excess temperature or pressure
Watts
This ASME Section IV temperature and pressure relief valve is constructed with a copper silicon alloy body. It features a 3/4 in male NPT inlet and a 3/4 in female NPT outlet. Used as a safety device on hot water heating boilers and storage tanks to automatically relieve excess temperature or pressure
This ASME Section IV temperature and pressure relief valve is constructed with a copper silicon alloy body and features 3/4 in male NPT inlet and 3/4 in female NPT outlet connections. It is designed to automatically relieve excess temperature or pressure in water heaters and storage tanks, helping prevent system failures in hydronic applications
Watts
This ASME Section IV temperature and pressure relief valve is constructed with a copper silicon alloy body and features 3/4 in male NPT inlet and 3/4 in female NPT outlet connections. It is designed to automatically relieve excess temperature or pressure in water heaters and storage tanks, helping prevent system failures in hydronic applications
Bronze temperature and pressure relief valve with 3/4 in MNPT x 3/4 in FNPT connections. ASME Section IV rated for use on hot water heating boilers and storage tanks to automatically relieve excess pressure or temperature
Watts
Bronze temperature and pressure relief valve with 3/4 in MNPT x 3/4 in FNPT connections. ASME Section IV rated for use on hot water heating boilers and storage tanks to automatically relieve excess pressure or temperature