We ship worldwide — Singapore, Australia, Malaysia, Indonesia, Philippines, India, Middle East & more

3G Electric
⌕
RFQ CartGet a QuoteSign inSign up
Watts Double Check Valve Assembly: 774, 3 in Pipe Size, Flange x Flange, 38 in Overall Lg - Watts Double Check Backflow Preventers
WattsWatts Double Check Backflow Preventers

Watts Double Check Valve Assembly: 774, 3 in Pipe Size, Flange x Flange, 38 in Overall Lg

The Watts 774 Double Check Valve Assembly is a 3-inch pipe size backflow preventer with flange x flange connections and an OSY gate valve shut-off. This model, MPN 774-OSY, has an overall length of 38 inches.

SKU 3G-OTH-434599

Brand
Watts
Item
Double Check Valve Assembly: 774, 3 in Pipe Size, Flange x Flange, 38 in Overall Lg
Category
Watts Double Check Backflow Preventers
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
774-OSY
Type
Flange x Flange, 774
Overall Lg
38 in
Pipe Size
3 in
Connection Type
Flange x Flange
Shut-Off Valve Type
OSY Gate Valve
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 774 Double Check Valve Assembly is a 3-inch pipe size backflow preventer with flange x flange connections and an OSY gate valve shut-off. This model, MPN 774-OSY, has an overall length of 38 inches.

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 watts double check backflow preventers. 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 Double Check Valve Assembly: 774, 10 in Pipe Size, Flange x Flange, 55.5 in Overall Lg, 774 (MPN 774-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
Watts
WATTS Double Check Valve Assembly: 774, 10 in Pipe Size, Flange x Flange, 55.5 in Overall Lg, 774 (MPN 774-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
WATTS Double Check Valve Assembly: 774, 2 1/2 in Pipe Size, Flange x Flange, 37 in Overall Lg, 774 (MPN 774-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
Watts
WATTS Double Check Valve Assembly: 774, 2 1/2 in Pipe Size, Flange x Flange, 37 in Overall Lg, 774 (MPN 774-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
WATTS Double Check Valve Assembly: 774, 12 in Pipe Size, Flange x Flange, 57.5 in Overall Lg, 774 (MPN 774-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
Watts
WATTS Double Check Valve Assembly: 774, 12 in Pipe Size, Flange x Flange, 57.5 in Overall Lg, 774 (MPN 774-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
WATTS Double Check Valve Assembly: 774, 6 in Pipe Size, Flange x Flange, 48.5 in Overall Lg, 774 (MPN 774-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
Watts
WATTS Double Check Valve Assembly: 774, 6 in Pipe Size, Flange x Flange, 48.5 in Overall Lg, 774 (MPN 774-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
WATTS Double Check Valve Assembly: 774, 8 in Pipe Size, Flange x Flange, 52.5 in Overall Lg, 774 (MPN 774-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
Watts
WATTS Double Check Valve Assembly: 774, 8 in Pipe Size, Flange x Flange, 52.5 in Overall Lg, 774 (MPN 774-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
WATTS Double Check Valve Assembly: LF709, 2 1/2 in Pipe Size, Flange x Flange, 39.44 in Overall Lg (MPN LF709-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
Watts
WATTS Double Check Valve Assembly: LF709, 2 1/2 in Pipe Size, Flange x Flange, 39.44 in Overall Lg (MPN LF709-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.

More from Watts

View all Watts parts →
WATTS Double Check Valve Assembly: 774, 4 in Pipe Size, Flange x Flange, 40 in Overall Lg, 774 (MPN 774-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
Watts
WATTS Double Check Valve Assembly: 774, 4 in Pipe Size, Flange x Flange, 40 in Overall Lg, 774 (MPN 774-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
WATTS Modular compact design: 007, 1 1/4 in Pipe Size, FNPT x FNPT, 16.38 in Overall Lg, Bronze, 007 (MPN 1-1/4 007M2-QT-FZ). Key specifications — Shut-Off Valve Type: Ball Valve; Connection Type: FNPT x FNPT.
Watts
WATTS Modular compact design: 007, 1 1/4 in Pipe Size, FNPT x FNPT, 16.38 in Overall Lg, Bronze, 007 (MPN 1-1/4 007M2-QT-FZ). Key specifications — Shut-Off Valve Type: Ball Valve; Connection Type: FNPT x FNPT.
WATTS Double Check Valve Assembly: LF709, 4 in Pipe Size, Flange x Flange, 52.38 in Overall Lg, 709 (MPN LF709-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
Watts
WATTS Double Check Valve Assembly: LF709, 4 in Pipe Size, Flange x Flange, 52.38 in Overall Lg, 709 (MPN LF709-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
WATTS Double Check Valve Assembly: LF709, 8 in Pipe Size, Flange x Flange, 75.44 in Overall Lg, 709 (MPN LF709-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
Watts
WATTS Double Check Valve Assembly: LF709, 8 in Pipe Size, Flange x Flange, 75.44 in Overall Lg, 709 (MPN LF709-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
WATTS Double Check Valve Assembly: LF709, 10 in Pipe Size, Flange x Flange, 90.44 in Overall Lg, 709 (MPN LF709-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
Watts
WATTS Double Check Valve Assembly: LF709, 10 in Pipe Size, Flange x Flange, 90.44 in Overall Lg, 709 (MPN LF709-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
WATTS Double Check Valve Assembly: LF719, 1 in Pipe Size, FIP x FIP, 19.5 in Overall Lg, Bronze, 719 (MPN LF719-QT-S). Key specifications — Shut-Off Valve Type: Ball Valve; Connection Type: FIP x FIP.
Watts
WATTS Double Check Valve Assembly: LF719, 1 in Pipe Size, FIP x FIP, 19.5 in Overall Lg, Bronze, 719 (MPN LF719-QT-S). Key specifications — Shut-Off Valve Type: Ball Valve; Connection Type: FIP x FIP.
WATTS Double Check Valve Assembly: LF709, 3 in Pipe Size, Flange x Flange, 40.44 in Overall Lg, 709 (MPN LF709-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
Watts
WATTS Double Check Valve Assembly: LF709, 3 in Pipe Size, Flange x Flange, 40.44 in Overall Lg, 709 (MPN LF709-OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
WATTS Double Check Valve Assembly: 757, 4 in Pipe Size, Flange x Flange, 33.75 in Overall Lg, PPO (MPN 4 757 OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.
Watts
WATTS Double Check Valve Assembly: 757, 4 in Pipe Size, Flange x Flange, 33.75 in Overall Lg, PPO (MPN 4 757 OSY). Key specifications — Shut-Off Valve Type: OSY Gate Valve; Connection Type: Flange x Flange.