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 Pressure Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Iron - ASME Section XIII Hot Water Pressure Relief Valves
WattsASME Section XIII Hot Water Pressure Relief Valves

Watts Pressure Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Iron

The WATTS Pressure Relief Valve (MPN 0358553) is an ASME Section XIII hot water pressure relief valve with FNPTF x FNPTF connections, 3/4 in x 3/4 in size, constructed of iron, and rated for a maximum operating…

SKU 3G-OTH-442468

Brand
Watts
Item
Pressure Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Iron
Category
ASME Section XIII Hot Water 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
0358553
Type
3/4 in x 3/4 in, Iron
Max. Op Pressure
20 psi
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 Pressure Relief Valve (MPN 0358553) is an ASME Section XIII hot water pressure relief valve with FNPTF x FNPTF connections, 3/4 in x 3/4 in size, constructed of iron, and rated for a maximum operating pressure of 20 psi.

Frequently Asked Questions

What is a Watts pressure relief valve used for?

A Watts pressure relief valve protects hot water systems from overpressure by automatically releasing water when pressure exceeds the set limit. It is commonly installed on water heaters, boilers, and storage tanks to prevent equipment damage and ensure safe operation in residential and commercial applications.

What are the specifications of the Watts 0358553 pressure relief valve?

The Watts 0358553 is an ASME Section XIII hot water pressure relief valve with 3/4 in FNPTF x 3/4 in FNPTF connections. It has a maximum operating pressure of 20 psi and is constructed from iron. The valve is designed for hot water systems and carries the manufacturer part number 0358553.

Where to buy Watts pressure relief valves worldwide?

3G Electric supplies Watts pressure relief valves worldwide. As a global industrial equipment distributor since 1990, we handle full logistics, customs clearance, and delivery to your location. Contact our team to source the Watts 0358553 or other models for your project.

How to install a Watts pressure relief valve?

Install the Watts valve on the hot water system outlet or tank tapping, ensuring the FNPTF threads are sealed with appropriate pipe compound. Orient the valve vertically with the discharge port facing down. Connect a discharge pipe to a safe drain location. Never install a shutoff valve between the relief valve and the system.

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 xiii hot water 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 Pressure Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Iron, 10 psi Max. Op Pressure (MPN 0358551). Key specifications — Brand: WATTS.
Watts
WATTS Pressure Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Iron, 10 psi Max. Op Pressure (MPN 0358551). Key specifications — Brand: WATTS.
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 0383308). Key specifications — Brand: WATTS.
Watts
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 0383308). Key specifications — Brand: WATTS.
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 0383025). Key specifications — Brand: WATTS.
Watts
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 0383025). Key specifications — Brand: WATTS.
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 in x 1 1/4 in, Iron, 75 psi Max. Op Pressure (MPN 0382818). Key specifications — Brand: WATTS.
Watts
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 in x 1 1/4 in, Iron, 75 psi Max. Op Pressure (MPN 0382818). Key specifications — Brand: WATTS.
WATTS Pressure Relief Valve: FNPTF x FNPTF, 2 in x 2 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 0384242). Key specifications — Brand: WATTS.
Watts
WATTS Pressure Relief Valve: FNPTF x FNPTF, 2 in x 2 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 0384242). Key specifications — Brand: WATTS.
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 1/2 in x 2 in, Iron, 75 psi Max. Op Pressure (MPN 0383792). Key specifications — Brand: WATTS.
Watts
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 1/2 in x 2 in, Iron, 75 psi Max. Op Pressure (MPN 0383792). Key specifications — Brand: WATTS.

More from Watts

View all Watts parts →
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 in x 1 in, Copper Silicon Alloy, 5 3/4 in Overall Ht (MPN 0121494). Key specifications — Brand: WATTS.
Watts
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 in x 1 in, Copper Silicon Alloy, 5 3/4 in Overall Ht (MPN 0121494). Key specifications — Brand: WATTS.
WATTS Relief Valve: FNPT x FNPT, 1 in x 1 in, Bronze, 94 psi Max. Op Pressure, 5 3/4 in Overall Ht (MPN 1 174A 125 FS). Key specifications — Brand: WATTS.
Watts
WATTS Relief Valve: FNPT x FNPT, 1 in x 1 in, Bronze, 94 psi Max. Op Pressure, 5 3/4 in Overall Ht (MPN 1 174A 125 FS). Key specifications — Brand: WATTS.
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/4 in, Copper Silicon Alloy (MPN F121524). Key specifications — Brand: WATTS.
Watts
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/4 in, Copper Silicon Alloy (MPN F121524). Key specifications — Brand: WATTS.
WATTS Boiler Pressure Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/2 in, Iron, 8 3/4 in Overall Ht (MPN 0383310). Key specifications — Brand: WATTS.
Watts
WATTS Boiler Pressure Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/2 in, Iron, 8 3/4 in Overall Ht (MPN 0383310). Key specifications — Brand: WATTS.
WATTS Pressure Relief Valve: NPTF x NPTF, 3/4 in x 3/4 in, Bronze, 125 psi Max. Op Pressure (MPN 0369010). Key specifications — Brand: WATTS.
Watts
WATTS Pressure Relief Valve: NPTF x NPTF, 3/4 in x 3/4 in, Bronze, 125 psi Max. Op Pressure (MPN 0369010). Key specifications — Brand: WATTS.
WATTS Relief Valve: FNPTF x FNPTF, 1 in x 1 in, Copper Silicon Alloy, 150 psi Max. Op Pressure (MPN 1 LF174A 150 FS). Key specifications — Brand: WATTS.
Watts
WATTS Relief Valve: FNPTF x FNPTF, 1 in x 1 in, Copper Silicon Alloy, 150 psi Max. Op Pressure (MPN 1 LF174A 150 FS). Key specifications — Brand: WATTS.
WATTS Relief Valve: FNPTF x FNPTF, 1 in x 1 1/4 in, Iron, 75 psi Max. Op Pressure (MPN 1 740 030 FS). Key specifications — Brand: WATTS.
Watts
WATTS Relief Valve: FNPTF x FNPTF, 1 in x 1 1/4 in, Iron, 75 psi Max. Op Pressure (MPN 1 740 030 FS). Key specifications — Brand: WATTS.
WATTS Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Bronze, 150 psi Max. Op Pressure (MPN 3/4 174A 100 FS). Key specifications — Brand: WATTS.
Watts
WATTS Relief Valve: FNPTF x FNPTF, 3/4 in x 3/4 in, Bronze, 150 psi Max. Op Pressure (MPN 3/4 174A 100 FS). Key specifications — Brand: WATTS.