We ship to the Philippines — door-to-door, customs and logistics handled by 3G Electric

Watts Backflow Preventer Repair Kits: First or Second Check Kit, 36JC66, 719/LF719 - Repair Kits & Parts for Watts Backflow Preventers

WattsRepair Kits & Parts for Watts Backflow Preventers

Watts Backflow Preventer Repair Kits: First or Second Check Kit, 36JC66, 719/LF719

The WATTS Backflow Preventer Repair Kits: First or Second Check Kit (SKU 844GG0) is a repair kit for Watts backflow preventers, compatible with the RK-LF719 series and model LF719. It includes a cover O-ring and is…

SKU 3G-OTH-436846

Brand

Watts

Item

Backflow Preventer Repair Kits: First or Second Check Kit, 36JC66, 719/LF719

Category

Repair Kits & Parts for Watts 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.

Create free account →Log in

Worldwide Shipping

Air & sea freight

Datasheet on Request

Technical specs

1-Day Quote

Replies within 24h

Technical Specifications

Watts

Manufacturer Part Number

RK 719-CK4-3/4 

Type

36JC66, 719/LF719, RK-LF719 

Includes

Cover O-Ring 

Compatible Valve Size

3/4 in 

Compatible with Series

RK-LF719 

Compatible with Mfr. Model No.

LF719 

Compatible with Grainger Part No.

36JC66 

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 Backflow Preventer Repair Kits: First or Second Check Kit (SKU 844GG0) is a repair kit for Watts backflow preventers, compatible with the RK-LF719 series and model LF719. It includes a cover O-ring and is designed for 3/4 in compatible valve sizes, with manufacturer part number RK 719-CK4-3/4.

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.

Browse all Watts products →Contact our engineers →

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Similar products

Matched by specification & description

WATTS Backflow Preventer Repair Kits: First or Second Check Kit, 36JC65, 719/LF719, RK-LF719 (MPN RK 719-CK4-1/2). Key specifications — Compatible Valve Size: 1/2 in; Compatible with Grainger Part No.: 36JC65; Compatible with Series: RK-LF719; Compatible with Mfr. Model No.: 719; Includes: Disc Holder.

WATTS Backflow Preventer Repair Kits: First or Second Check Kit, 36JC65, 719/LF719, RK-LF719 (MPN RK 719-CK4-1/2). Key specifications — Compatible Valve Size: 1/2 in; Compatible with Grainger Part No.: 36JC65; Compatible with Series: RK-LF719; Compatible with Mfr. Model No.: 719; Includes: Disc Holder.

WATTS Backflow Preventer Repair Kits: First or Second Check Kit, 36JC68/36JC69, 719/LF719, RK-LF719 (MPN RK 719-CK4 1-1/4-1-1/2). Key specifications — Compatible Valve Size: 1-1/4 in to 1-1/2 in; Compatible with Grainger Part No.: 36JC68; Compatible with Series: RK-LF719; Compatible with Mfr. Model No.: LF719; Includes: Disc Holder.

WATTS Backflow Preventer Repair Kits: First or Second Check Kit, 36JC68/36JC69, 719/LF719, RK-LF719 (MPN RK 719-CK4 1-1/4-1-1/2). Key specifications — Compatible Valve Size: 1-1/4 in to 1-1/2 in; Compatible with Grainger Part No.: 36JC68; Compatible with Series: RK-LF719; Compatible with Mfr. Model No.: LF719; Includes: Disc Holder.

WATTS Backflow Preventer Repair Kits: First or Second Check Kit, 36JC67, 1 in Compatible Valve Size (MPN RK 719-CK4 1). Key specifications — Compatible Valve Size: 1 in; Compatible with Grainger Part No.: 36JC67; Compatible with Series: RK-LF719; Compatible with Mfr. Model No.: LF719; Includes: Spring O-Ring.

WATTS Backflow Preventer Repair Kits: First or Second Check Kit, 36JC67, 1 in Compatible Valve Size (MPN RK 719-CK4 1). Key specifications — Compatible Valve Size: 1 in; Compatible with Grainger Part No.: 36JC67; Compatible with Series: RK-LF719; Compatible with Mfr. Model No.: LF719; Includes: Spring O-Ring.

WATTS Backflow Preventer Repair Kits: First or Second Check Kit, 36JC70, 2 in Compatible Valve Size (MPN RK 719-CK4 2). Key specifications — Compatible Valve Size: 2 in; Compatible with Grainger Part No.: 36JC70; Compatible with Series: RK-LF719; Compatible with Mfr. Model No.: LF719; Includes: Disc Holder.

WATTS Backflow Preventer Repair Kits: First or Second Check Kit, 36JC70, 2 in Compatible Valve Size (MPN RK 719-CK4 2). Key specifications — Compatible Valve Size: 2 in; Compatible with Grainger Part No.: 36JC70; Compatible with Series: RK-LF719; Compatible with Mfr. Model No.: LF719; Includes: Disc Holder.

WATTS Backflow Preventer Repair Kits: First or Second Check Kit, 36JC57/36JC63, 709/LF709, RK-LF709 (MPN LFRK 709-CK4 8). Key specifications — Compatible Valve Size: 8 in; Compatible with Grainger Part No.: 36JC57; Compatible with Series: RK-LF709; Compatible with Mfr. Model No.: 709; Includes: Cover O-Ring.

WATTS Backflow Preventer Repair Kits: First or Second Check Kit, 36JC57/36JC63, 709/LF709, RK-LF709 (MPN LFRK 709-CK4 8). Key specifications — Compatible Valve Size: 8 in; Compatible with Grainger Part No.: 36JC57; Compatible with Series: RK-LF709; Compatible with Mfr. Model No.: 709; Includes: Cover O-Ring.

WATTS Backflow Preventer Repair Kits: First or Second Check Kit, 36JC55/36JC61, 709/LF709, RK-LF709 (MPN LFRK 709-CK4 4). Key specifications — Compatible Valve Size: 4 in; Compatible with Grainger Part No.: 36JC55; Compatible with Series: RK-LF709; Compatible with Mfr. Model No.: 709; Includes: Cover O-Ring.

WATTS Backflow Preventer Repair Kits: First or Second Check Kit, 36JC55/36JC61, 709/LF709, RK-LF709 (MPN LFRK 709-CK4 4). Key specifications — Compatible Valve Size: 4 in; Compatible with Grainger Part No.: 36JC55; Compatible with Series: RK-LF709; Compatible with Mfr. Model No.: 709; Includes: Cover O-Ring.

More from Watts

View all Watts parts →

WATTS Backflow Preventer Repair Kits: Second Check Kit, 1KYD7/1KYD9/1KYE2, 757/757DCDA, Repair Kit (MPN RK757/757DCDA-CK2-21/2-4). Key specifications — Compatible Valve Size: 2-1/2 in to 4 in; Compatible with Grainger Part No.: 1KYE2; Compatible with Series: 757DCDA; Compatible with Mfr. Model No.: 757DCDA; Includes: Second Check Module.

WATTS Backflow Preventer Repair Kits: Second Check Kit, 1KYD7/1KYD9/1KYE2, 757/757DCDA, Repair Kit (MPN RK757/757DCDA-CK2-21/2-4). Key specifications — Compatible Valve Size: 2-1/2 in to 4 in; Compatible with Grainger Part No.: 1KYE2; Compatible with Series: 757DCDA; Compatible with Mfr. Model No.: 757DCDA; Includes: Second Check Module.

WATTS Backflow Preventer Repair Kit: Backflow Preventer Repair Kit, 809GD0, 2 LF919-QT-S-FS, RK-919 (MPN RK 919-T 2). Key specifications — Compatible Valve Size: 2 in; Compatible with Grainger Part No.: 809GD0; Compatible with Series: RK-919; Compatible with Mfr. Model No.: 2 LF919-QT-S-FS; Includes: First Check Repair Kit.

WATTS Backflow Preventer Repair Kit: Backflow Preventer Repair Kit, 809GD0, 2 LF919-QT-S-FS, RK-919 (MPN RK 919-T 2). Key specifications — Compatible Valve Size: 2 in; Compatible with Grainger Part No.: 809GD0; Compatible with Series: RK-919; Compatible with Mfr. Model No.: 2 LF919-QT-S-FS; Includes: First Check Repair Kit.

WATTS First Check Valve Repair Kit: First Check Valve Repair Kit, 793PG7, 6 in Compatible Valve Size (MPN 909 6 1st Check Kit). Key specifications — Compatible Valve Size: 6 in; Compatible with Grainger Part No.: 793PG7; Compatible with Series: RK-909; Compatible with Mfr. Model No.: 6 LF909; Includes: Lubricant.

WATTS First Check Valve Repair Kit: First Check Valve Repair Kit, 793PG7, 6 in Compatible Valve Size (MPN 909 6 1st Check Kit). Key specifications — Compatible Valve Size: 6 in; Compatible with Grainger Part No.: 793PG7; Compatible with Series: RK-909; Compatible with Mfr. Model No.: 6 LF909; Includes: Lubricant.

WATTS Second Check Valve Repair Kit: Second Check Valve Repair Kit, 6A769/812MY7/818DF4, Repair Kit (MPN 007 M1 1-1/2 - 2 2nd Check Kit). Key specifications — Compatible Valve Size: 1-1/2 in to 2 in; Compatible with Grainger Part No.: 6A769; Compatible with Series: 007; Compatible with Mfr. Model No.: 1-1/2 - 2 007M1/LF007M1; Includes: Disc Assembly.

WATTS Second Check Valve Repair Kit: Second Check Valve Repair Kit, 6A769/812MY7/818DF4, Repair Kit (MPN 007 M1 1-1/2 - 2 2nd Check Kit). Key specifications — Compatible Valve Size: 1-1/2 in to 2 in; Compatible with Grainger Part No.: 6A769; Compatible with Series: 007; Compatible with Mfr. Model No.: 1-1/2 - 2 007M1/LF007M1; Includes: Disc Assembly.

WATTS Backflow Preventer Repair Kits: First Check Kit, 36JD25/36JD26/36JD27/6AUW9, 994/994RPDA (MPN RK994/994RPDA-CK1-21/2-4). Key specifications — Compatible Valve Size: 2-1/2 in to 4 in; Compatible with Grainger Part No.: 36JD25; Compatible with Series: 994RPDA; Compatible with Mfr. Model No.: 994; Includes: Cam Arm.

WATTS Backflow Preventer Repair Kits: First Check Kit, 36JD25/36JD26/36JD27/6AUW9, 994/994RPDA (MPN RK994/994RPDA-CK1-21/2-4). Key specifications — Compatible Valve Size: 2-1/2 in to 4 in; Compatible with Grainger Part No.: 36JD25; Compatible with Series: 994RPDA; Compatible with Mfr. Model No.: 994; Includes: Cam Arm.

WATTS First Check Valve Repair Kit: First Check Valve Repair Kit, 793PG1/793PG2/793PG3/793PG5 (MPN 909 2-1/2 - 3 1st Check Kit). Key specifications — Compatible Valve Size: 2-1/2 in to 3 in; Compatible with Grainger Part No.: 793PG1; Compatible with Series: RK-LF909; Compatible with Mfr. Model No.: 2-1/2-3 LF909; Includes: Cover O-Ring.

WATTS First Check Valve Repair Kit: First Check Valve Repair Kit, 793PG1/793PG2/793PG3/793PG5 (MPN 909 2-1/2 - 3 1st Check Kit). Key specifications — Compatible Valve Size: 2-1/2 in to 3 in; Compatible with Grainger Part No.: 793PG1; Compatible with Series: RK-LF909; Compatible with Mfr. Model No.: 2-1/2-3 LF909; Includes: Cover O-Ring.

WATTS Backflow Preventer Repair Kits: First or Second Check Kit, 36JC58/36JC64, 709/LF709, RK-LF709 (MPN LFRK 709-CK4 10). Key specifications — Compatible Valve Size: 10 in; Compatible with Grainger Part No.: 36JC58; Compatible with Series: RK-LF709; Compatible with Mfr. Model No.: LF709; Includes: Disc and Spring Assembly.

WATTS Backflow Preventer Repair Kits: First or Second Check Kit, 36JC58/36JC64, 709/LF709, RK-LF709 (MPN LFRK 709-CK4 10). Key specifications — Compatible Valve Size: 10 in; Compatible with Grainger Part No.: 36JC58; Compatible with Series: RK-LF709; Compatible with Mfr. Model No.: LF709; Includes: Disc and Spring Assembly.

WATTS Backflow Preventer Repair Kits: Complete Rubber Parts Kit, 793HG1/793HG2/818DE6/818SE8, RK-007 (MPN RK 007M2-RT 1-1/4-1-1/2). Key specifications — Compatible Valve Size: 1-1/4 in to 1-1/2 in; Compatible with Grainger Part No.: 818SE8; Compatible with Series: RK-007; Compatible with Mfr. Model No.: 1-1/4 LF007M2; Includes: Cover O-Ring.

WATTS Backflow Preventer Repair Kits: Complete Rubber Parts Kit, 793HG1/793HG2/818DE6/818SE8, RK-007 (MPN RK 007M2-RT 1-1/4-1-1/2). Key specifications — Compatible Valve Size: 1-1/4 in to 1-1/2 in; Compatible with Grainger Part No.: 818SE8; Compatible with Series: RK-007; Compatible with Mfr. Model No.: 1-1/4 LF007M2; Includes: Cover O-Ring.