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Watts Backflow Preventer Repair Kits: First or Second Check Kit, 36JC65, 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, 36JC65, 719/LF719

The WATTS Backflow Preventer Repair Kits: First or Second Check Kit (SKU 844GG4) is a repair kit for Watts backflow preventers, including a disc holder. It is compatible with 1/2 in valve sizes and the RK-LF719…

SKU 3G-OTH-436791

Brand
Watts
Item
Backflow Preventer Repair Kits: First or Second Check Kit, 36JC65, 719/LF719
Category
Repair Kits & Parts for Watts Backflow Preventers
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Technical Specifications

Watts
Manufacturer Part Number
RK 719-CK4-1/2
Type
36JC65, 719/LF719, RK-LF719
Includes
Disc Holder
Compatible Valve Size
1/2 in
Compatible with Series
RK-LF719
Compatible with Mfr. Model No.
719
Compatible with Grainger Part No.
36JC65
View Full Spec Sheet

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Watts Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The WATTS Backflow Preventer Repair Kits: First or Second Check Kit (SKU 844GG4) is a repair kit for Watts backflow preventers, including a disc holder. It is compatible with 1/2 in valve sizes and the RK-LF719 series, specifically for model 719 (MPN RK 719-CK4-1/2).

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.

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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.
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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, 36JC66, 719/LF719, RK-LF719 (MPN RK 719-CK4-3/4). Key specifications — Compatible Valve Size: 3/4 in; Compatible with Grainger Part No.: 36JC66; Compatible with Series: RK-LF719; Compatible with Mfr. Model No.: LF719; Includes: Cover O-Ring.
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WATTS Backflow Preventer Repair Kits: First or Second Check Kit, 36JC66, 719/LF719, RK-LF719 (MPN RK 719-CK4-3/4). Key specifications — Compatible Valve Size: 3/4 in; Compatible with Grainger Part No.: 36JC66; Compatible with Series: RK-LF719; Compatible with Mfr. Model No.: LF719; Includes: Cover 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.
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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, 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.
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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, 36JC53/36JC54/36JC59/36JC60 (MPN LFRK 709-CK4 2-1/2-3). Key specifications — Compatible Valve Size: 2-1/2 in to 3 in; Compatible with Grainger Part No.: 36JC53; Compatible with Series: RK-LF709; Compatible with Mfr. Model No.: 709; Includes: Disc and Spring Assembly.
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WATTS Backflow Preventer Repair Kits: Complete Rubber Parts Kit, 36JC65, 719/LF719, Repair Kit, 719 (MPN RK 719-RT 1/2). Key specifications — Compatible Valve Size: 1/2 in; Compatible with Grainger Part No.: 36JC65; Compatible with Series: 719; Compatible with Mfr. Model No.: LF719; Includes: (2) Check Rubbers.
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WATTS Backflow Preventer Repair Kits: Complete Rubber Parts Kit, 36JC65, 719/LF719, Repair Kit, 719 (MPN RK 719-RT 1/2). Key specifications — Compatible Valve Size: 1/2 in; Compatible with Grainger Part No.: 36JC65; Compatible with Series: 719; Compatible with Mfr. Model No.: LF719; Includes: (2) Check Rubbers.

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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.
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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.
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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.
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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.
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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.
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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.