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

Watts RK957/957RPDA-CK1-21/2-4 First Check Repair Kit for 2-1/2 - Repair Kits & Parts for Watts Backflow Preventers
WattsRepair Kits & Parts for Watts Backflow Preventers

Watts RK957/957RPDA-CK1-21/2-4 First Check Repair Kit for 2-1/2

The WATTS Backflow Preventer Repair Kits: First Check Kit (SKU 3G-OTH-436755) is a repair kit for Watts backflow preventers, including a First Check Module. It is compatible with valve sizes 2-1/2 in to 4 in, Series…

SKU 3G-OTH-436755

Also listed as: RK957957RPDACK12124 · RK957 957RPDA CK1 21 2 4 · RK957-957RPDA-CK1-21-2-4

Brand
Watts
Item
RK957/957RPDA-CK1-21/2-4 First Check Repair Kit for 2-1/2
Category
Repair Kits & Parts for Watts Backflow Preventers
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
RK957/957RPDA-CK1-21/2-4
Type
1RCX3/1RCX5/1RCX7, 757/757DCDA, Repair Kit
Includes
First Check Module
Compatible Valve Size
2-1/2 in to 4 in
Compatible with Series
RK-957
Compatible with Mfr. Model No.
757DCDA

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 Backflow Preventer Repair Kits: First Check Kit (SKU 3G-OTH-436755) is a repair kit for Watts backflow preventers, including a First Check Module. It is compatible with valve sizes 2-1/2 in to 4 in, Series RK-957, and manufacturer model number 757DCDA. The kit is identified by manufacturer part number RK957/957RPDA-CK1-21/2-4 and is compatible with part number 1RCX7.

Frequently Asked Questions

What is the Watts backflow preventer first check repair kit used for?

This repair kit is used to replace the first check module in Watts 757DCDA and compatible backflow preventers. It helps maintain backflow prevention in commercial and industrial water systems, ensuring cross-connection control and compliance with plumbing codes.

What are the specifications of the Watts RK957/957RPDA-CK1-21/2-4 repair kit?

The kit includes a First Check Module and is compatible with valve sizes 2-1/2 in to 4 in. It works with Watts Series RK-957 and model 757DCDA backflow preventers. The manufacturer part number is RK957/957RPDA-CK1-21/2-4, and it is also compatible with part number 957OSY4.

Where to buy Watts backflow preventer repair kits worldwide?

3G Electric supplies Watts backflow preventer repair kits worldwide. As a global industrial equipment distributor, we handle full logistics, customs clearance, and delivery to your location. Contact us to source the RK957/957RPDA-CK1-21/2-4 kit for your maintenance needs.

How to install the Watts first check repair kit?

Installation involves shutting off water supply, depressurizing the system, and removing the old first check module from the backflow preventer. Replace it with the new module from the kit, ensuring proper seating and orientation. Reassemble and test per Watts guidelines. Always follow local plumbing codes.

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 repair kits & parts for watts 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

Compatible alternatives & equivalents

Cross-referenced by specification & description
WATTS Backflow Preventer Repair Kits: Second Check Kit, 957-OSY 21/2/957-OSY3/957OSY4, 957/957RPDA, Repair Kit (MPN RK957/957RPDA-CK2-21/2-4)
Watts
WATTS Backflow Preventer Repair Kits: Second Check Kit, 957-OSY 21/2/957-OSY3/957OSY4, 957/957RPDA, Repair Kit (MPN RK957/957RPDA-CK2-21/2-4)
WATTS Backflow Preventer Repair Kits: Complete Rubber Parts Kit, 957-OSY 21/2/957-OSY3/957OSY4, 957/957RPDA (MPN RK 957/957RPDA-RT 21/2-4)
Watts
WATTS Backflow Preventer Repair Kits: Complete Rubber Parts Kit, 957-OSY 21/2/957-OSY3/957OSY4, 957/957RPDA (MPN RK 957/957RPDA-RT 21/2-4)
Repair kit for Watts 809GC8/809GC9 and 919/LF919 backflow preventers. Includes check assembly. Compatible with valve sizes 1-1/4 in to 1-1/2 in. Used to restore proper backflow prevention in water systems
Watts
Repair kit for Watts 809GC8/809GC9 and 919/LF919 backflow preventers. Includes check assembly. Compatible with valve sizes 1-1/4 in to 1-1/2 in. Used to restore proper backflow prevention in water systems
Repair kit for Watts backflow preventers, includes second check repair kit. Compatible with 1 in valve sizes, Series RK-919, and model LF919-QT-S-FS. Used to service backflow prevention assemblies in water systems
Watts
Repair kit for Watts backflow preventers, includes second check repair kit. Compatible with 1 in valve sizes, Series RK-919, and model LF919-QT-S-FS. Used to service backflow prevention assemblies in water systems
Repair kit for Watts backflow preventers, includes a check assembly. Compatible with 1-inch valve sizes, Series RK-919, and Model 919. Used to replace the second check valve assembly in backflow prevention systems
Watts
Repair kit for Watts backflow preventers, includes a check assembly. Compatible with 1-inch valve sizes, Series RK-919, and Model 919. Used to replace the second check valve assembly in backflow prevention systems
WATTS Backflow Preventer Repair Kits: First Check Kit, 3/4 LF919-QT-S-FS, 3/4 in Compatible Valve Size, RK-919 (MPN RK 919-CK1-3/4)
Watts
WATTS Backflow Preventer Repair Kits: First Check Kit, 3/4 LF919-QT-S-FS, 3/4 in Compatible Valve Size, RK-919 (MPN RK 919-CK1-3/4)

More from Watts

View all Watts parts
Repair kit for Watts backflow preventers, includes (2) check seat O-rings. Compatible with 3/4 in valve size, Series RK-919, and model LF919. Used to replace worn rubber components in backflow preventers for maintaining proper sealing
Watts
Repair kit for Watts backflow preventers, includes (2) check seat O-rings. Compatible with 3/4 in valve size, Series RK-919, and model LF919. Used to replace worn rubber components in backflow preventers for maintaining proper sealing
Vent elbow repair part for Watts backflow preventers, compatible with Series 909 ELF. Designed for 4-inch valve size and fits model 1-1/4 - 009M1. Used as an air gap and elbow component in backflow prevention assemblies to maintain proper drainage
Watts
Vent elbow repair part for Watts backflow preventers, compatible with Series 909 ELF. Designed for 4-inch valve size and fits model 1-1/4 - 009M1. Used as an air gap and elbow component in backflow prevention assemblies to maintain proper drainage
Repair kit for the first check valve in Watts Series 009 backflow preventers. Includes relief valve repair kit. Compatible with valve sizes 2-1/2 in to 3 in and model 2-1/2 -3 LF009. Used for servicing backflow preventers in water systems
Watts
Repair kit for the first check valve in Watts Series 009 backflow preventers. Includes relief valve repair kit. Compatible with valve sizes 2-1/2 in to 3 in and model 2-1/2 -3 LF009. Used for servicing backflow preventers in water systems
Repair kit for Watts backflow preventers, compatible with Series RK-909 and valve size 1-1/2 in. Includes a check disc. Fits models 818DD1, 818DD7, and 818DE2. Used to service backflow preventers in water systems
Watts
Repair kit for Watts backflow preventers, compatible with Series RK-909 and valve size 1-1/2 in. Includes a check disc. Fits models 818DD1, 818DD7, and 818DE2. Used to service backflow preventers in water systems
This repair kit includes a complete relief valve assembly for Watts backflow preventers. It is compatible with valve sizes 2-1/2 in to 4 in and fits series 957 and 957RPDA models. Used to replace worn relief valve components in commercial water systems
Watts
This repair kit includes a complete relief valve assembly for Watts backflow preventers. It is compatible with valve sizes 2-1/2 in to 4 in and fits series 957 and 957RPDA models. Used to replace worn relief valve components in commercial water systems
Repair kit for Watts Series 719 and LF719 backflow preventers. Includes two check rubbers. Compatible with 1/2 in valve sizes. Restores sealing performance to prevent reverse water flow in plumbing systems
Watts
Repair kit for Watts Series 719 and LF719 backflow preventers. Includes two check rubbers. Compatible with 1/2 in valve sizes. Restores sealing performance to prevent reverse water flow in plumbing systems
This repair kit is for the second check valve in Watts Series 009 backflow preventers. It includes a cover O-ring and is compatible with valve sizes from 1/4 in to 1/2 in. Used to replace worn internal components in commercial and residential water systems
Watts
This repair kit is for the second check valve in Watts Series 009 backflow preventers. It includes a cover O-ring and is compatible with valve sizes from 1/4 in to 1/2 in. Used to replace worn internal components in commercial and residential water systems
Repair kit for Watts Series 009 backflow preventers. Includes a seat O-ring. Compatible with valve sizes from 1-1/4 in to 2 in for models 009M1 and LF009M1. Used to replace worn relief valve components in water system backflow prevention assemblies
Watts
Repair kit for Watts Series 009 backflow preventers. Includes a seat O-ring. Compatible with valve sizes from 1-1/4 in to 2 in for models 009M1 and LF009M1. Used to replace worn relief valve components in water system backflow prevention assemblies