AquaMatic K520-RA Seal Kit (EPDM) for 1/2-Inch Diaphragm Valves

Ensure peak hydraulic performance and leak-free reliability in your water treatment systems with the Genuine AquaMatic K520-RA EPDM Seal Kit (SKU: 1081784 / 2001007001). Manufactured by AqMatic (formerly Pentair), this professional preventative maintenance kit is engineered explicitly for standard 1/2-Inch K520 Series Composite Body Diaphragm Valves.

By utilizing premium EPDM (Ethylene Propylene Diene Monomer) elastomer, this kit provides exceptional resilience in standard commercial water applications. It is the factory-recommended choice for water softeners, demineralizers, multi-media filtration systems, and general industrial water distribution loops.

Key Features & Benefits

• Premium EPDM Elastomer: Delivers outstanding resistance to aging, weathering, water, steam, and mild acids or alkalis, making it the perfect all-around choice for clean water applications.

• Restores Drip-Tight Sealing: Replaces the critical high-wear flexible components to prevent internal bypass leaks and maintain a perfect hydraulic pressure boundary.

• Factory-Spec Fit & Tolerance: Crafted to exact manufacturer dimensions for standard 1/2" K520 Y-pattern composite valves, ensuring smooth vertical stroke travel.

• Cost-Effective In-Line Service: Allows you to swap out internal seals quickly while the valve remains connected to the piping manifold, dramatically reducing system downtime.

Comprehensive Kit Parts List

The K520-RA Kit includes all the essential, high-flex sealing elements required to overhaul the upper and lower fluid chambers during routine servicing:

• 1 x EPDM Sealing Disc (Item No. 3): The primary seat insert responsible for creating a positive, drop-tight seal against fluid flow.

• 1 x Fabric-Reinforced EPDM Diaphragm (Item No. 8): The flexible central pressure barrier that isolates the control chambers while maintaining superior cycle life. 1078035

• 4 x Precision EPDM O-Rings (Item No. 6, 7, 9, 15): High-performance static and dynamic O-rings required to isolate the shaft, shaft guide body, and cap-to-body interface against high line pressures.

Technical Specifications

Recommended Tooling & Accessories

When disassembling glass-filled thermoplastic valves, maintaining precise alignment is critical to protect internal threads from stripping. Technicians should always perform this service using the official AquaMatic 520-Z Assembly Tool, which locks securely into the internal shaft configurations to prevent accidental physical damage.

Pro Maintenance Tip: If you notice internal bypass issues but find your seals are intact during teardown, check the rigid internal plastic framing for scoring or scaling. If wear is present, consider pairing this seal kit with a K520-RFN Plastic Internal Parts Kit.