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 Water Pressure Reducing Valve: NPT x NPT, 1 1/4 in Pipe Size, Brass - Standard Capacity Water Pressure Regulators
WattsStandard Capacity Water Pressure Regulators

Watts Water Pressure Reducing Valve: NPT x NPT, 1 1/4 in Pipe Size, Brass

The WATTS Water Pressure Reducing Valve is a standard capacity water pressure regulator with NPT x NPT connections. This brass valve, model 11/4 LF N55BU, is low-lead compliant and has a 1 1/4 in pipe size with an…

SKU 3G-OTH-439543

Brand
Watts
Item
Water Pressure Reducing Valve: NPT x NPT, 1 1/4 in Pipe Size, Brass
Category
Standard Capacity Water Pressure Regulators
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
11/4 LF N55BU
Type
Brass, 25 psi to 75 psi
Pipe Size
1 1/4 in
Low-Lead Compliance
Low-Lead Compliant
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 Water Pressure Reducing Valve is a standard capacity water pressure regulator with NPT x NPT connections. This brass valve, model 11/4 LF N55BU, is low-lead compliant and has a 1 1/4 in pipe size with an adjustable pressure range of 25 psi to 75 psi.

Frequently Asked Questions

What is the WATTS water pressure reducing valve used for?

The WATTS water pressure reducing valve is used to reduce and regulate incoming water pressure in commercial and residential plumbing systems. It protects downstream fixtures and piping from damage caused by excessive pressure, ensuring consistent flow and extending equipment life.

What are the specifications of the WATTS 11/4 LF N55BU valve?

The WATTS 11/4 LF N55BU is a standard capacity water pressure regulator with NPT x NPT connections. It has a 1 1/4 in pipe size, a brass body, and an adjustable pressure range of 25 psi to 75 psi. It is low-lead compliant for potable water applications.

Where to buy the WATTS water pressure reducing valve worldwide?

You can source the WATTS water pressure reducing 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 on this WATTS model.

How to install a WATTS water pressure reducing valve?

Install the WATTS valve in the main water line after the shut-off valve, with the arrow on the body pointing in the flow direction. Use pipe thread sealant on NPT connections and install a pressure gauge downstream to adjust the set point within the 25 psi to 75 psi range.

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 standard capacity water pressure regulators. 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 Water Pressure Reducing Valve: NPT x NPT, 2 in Pipe Size, Bronze, 25 psi to 75 psi, NPT x NPT (MPN 2 LF N55BU). Key specifications — Brand: WATTS; Low-Lead Compliance: Low-Lead Compliant.
Watts
WATTS Water Pressure Reducing Valve: NPT x NPT, 2 in Pipe Size, Bronze, 25 psi to 75 psi, NPT x NPT (MPN 2 LF N55BU). Key specifications — Brand: WATTS; Low-Lead Compliance: Low-Lead Compliant.
WATTS Water Pressure Reducing Valve: NPT x NPT, 1/2 in Pipe Size, Brass, 25 psi to 75 psi, NPT x NPT (MPN 1/2 LF 223). Key specifications — Brand: WATTS; Low-Lead Compliance: Low-Lead Compliant.
Watts
WATTS Water Pressure Reducing Valve: NPT x NPT, 1/2 in Pipe Size, Brass, 25 psi to 75 psi, NPT x NPT (MPN 1/2 LF 223). Key specifications — Brand: WATTS; Low-Lead Compliance: Low-Lead Compliant.
WATTS Water Pressure Reducing Valve: NPT x NPT, 1 1/2 in Pipe Size, Brass, 25 psi to 75 psi (MPN 11/2 LF 223). Key specifications — Brand: WATTS; Low-Lead Compliance: Low-Lead Compliant.
Watts
WATTS Water Pressure Reducing Valve: NPT x NPT, 1 1/2 in Pipe Size, Brass, 25 psi to 75 psi (MPN 11/2 LF 223). Key specifications — Brand: WATTS; Low-Lead Compliance: Low-Lead Compliant.
WATTS Water Pressure Reducing Valve: NPT x NPT, 1 1/2 in Pipe Size, Copper Silicon Alloy, NPT x NPT (MPN 11/2 LF 25AUBZ3). Key specifications — Brand: WATTS; Low-Lead Compliance: Low-Lead Compliant.
Watts
WATTS Water Pressure Reducing Valve: NPT x NPT, 1 1/2 in Pipe Size, Copper Silicon Alloy, NPT x NPT (MPN 11/2 LF 25AUBZ3). Key specifications — Brand: WATTS; Low-Lead Compliance: Low-Lead Compliant.
WATTS Water Pressure Reducing Valve: NPT x NPT, 1/2 in Pipe Size, Brass, 25 psi to 75 psi, NPT x NPT (MPN 1/2 LF U5BZ3). Key specifications — Brand: WATTS; Low-Lead Compliance: Low-Lead Compliant.
Watts
WATTS Water Pressure Reducing Valve: NPT x NPT, 1/2 in Pipe Size, Brass, 25 psi to 75 psi, NPT x NPT (MPN 1/2 LF U5BZ3). Key specifications — Brand: WATTS; Low-Lead Compliance: Low-Lead Compliant.
WATTS Water Pressure Reducing Valve: NPT x NPT, 1 1/4 in Pipe Size, Brass, 25 psi to 75 psi (MPN 11/4 LF 223). Key specifications — Brand: WATTS; Low-Lead Compliance: Low-Lead Compliant.
Watts
WATTS Water Pressure Reducing Valve: NPT x NPT, 1 1/4 in Pipe Size, Brass, 25 psi to 75 psi (MPN 11/4 LF 223). Key specifications — Brand: WATTS; Low-Lead Compliance: Low-Lead Compliant.

More from Watts

View all Watts parts →
WATTS Pressure Regulator: FNPT x FNPT, 3/8 in Pipe Size, Stainless Steel, 10 psi to 125 psi (MPN 3/8 SS 263A 10 125). Key specifications — Brand: WATTS.
Watts
WATTS Pressure Regulator: FNPT x FNPT, 3/8 in Pipe Size, Stainless Steel, 10 psi to 125 psi (MPN 3/8 SS 263A 10 125). Key specifications — Brand: WATTS.
WATTS Boiler Feed Valve: Union Solder x FNPT, Brass, 212°F Max. Op Temp, 5 1/4 in Overall Ht (MPN B911S-M3). Key specifications — Brand: WATTS.
Watts
WATTS Boiler Feed Valve: Union Solder x FNPT, Brass, 212°F Max. Op Temp, 5 1/4 in Overall Ht (MPN B911S-M3). Key specifications — Brand: WATTS.
WATTS Pressure Regulator: FNPT x FNPT, 3/8 in Pipe Size, Stainless Steel, 3 psi to 50 psi, NPT x NPT (MPN 3/8 SS 263A 3 50). Key specifications — Brand: WATTS.
Watts
WATTS Pressure Regulator: FNPT x FNPT, 3/8 in Pipe Size, Stainless Steel, 3 psi to 50 psi, NPT x NPT (MPN 3/8 SS 263A 3 50). Key specifications — Brand: WATTS.
WATTS Pressure Regulator: FNPT x FNPT, 1/4 in Pipe Size, Stainless Steel, 100 psi to 300 psi (MPN 1/4 SS 263 A 100 300). Key specifications — Brand: WATTS.
Watts
WATTS Pressure Regulator: FNPT x FNPT, 1/4 in Pipe Size, Stainless Steel, 100 psi to 300 psi (MPN 1/4 SS 263 A 100 300). Key specifications — Brand: WATTS.
WATTS Water Pressure Regulator: FNPT x FNPT, 1 in Pipe Size, Brass, 10 psi to 35 psi, NPT x NPT (MPN 1 LFU5B-LP-Z3). Key specifications — Brand: WATTS.
Watts
WATTS Water Pressure Regulator: FNPT x FNPT, 1 in Pipe Size, Brass, 10 psi to 35 psi, NPT x NPT (MPN 1 LFU5B-LP-Z3). Key specifications — Brand: WATTS.
WATTS Boiler Feed Water Pressure Regulator: MNPT x MNPT, 1/2 in Pipe Size, Cast Iron, NPT x NPT (MPN 1156F-A). Key specifications — Brand: WATTS.
Watts
WATTS Boiler Feed Water Pressure Regulator: MNPT x MNPT, 1/2 in Pipe Size, Cast Iron, NPT x NPT (MPN 1156F-A). Key specifications — Brand: WATTS.
WATTS Pressure Reducing Valve: FNPT x FNPT, Iron, 160°F Max. Op Temp, 6 3/8 in Overall Ht, NPT x NPT (MPN 0121243). Key specifications — Brand: WATTS.
Watts
WATTS Pressure Reducing Valve: FNPT x FNPT, Iron, 160°F Max. Op Temp, 6 3/8 in Overall Ht, NPT x NPT (MPN 0121243). Key specifications — Brand: WATTS.
WATTS Boiler Feed Water Pressure Regulator: FNPT x F, 1/2 in Pipe Size, Bronze, 10 psi to 25 psi (MPN B1156F). Key specifications — Brand: WATTS.
Watts
WATTS Boiler Feed Water Pressure Regulator: FNPT x F, 1/2 in Pipe Size, Bronze, 10 psi to 25 psi (MPN B1156F). Key specifications — Brand: WATTS.