AquaMatic K526-RA Diaphragm & Seals Kit - EPDM | Part 1070275

The AquaMatic K526-RA Diaphragm & Seals Kit (Manufacturer Part Number: 1070275) is a premium, factory-original elastomer maintenance kit engineered exclusively for AquaMatic K526 Series 2.5-inch composite body diaphragm valves.

This authentic RA configuration utilizes high-grade EP (EPDM) elastomeric components, featuring the heavy-duty 1075177 (526-FB) Diaphragm. It is the factory-recommended solution for restoring optimal sealing performance, maintaining strict control chamber pressure isolation, and preventing internal bypass or external weeping in high-flow commercial and industrial water conditioning setups. The EPDM compound provides exceptional resistance to ozone, environmental aging, hot water, and mild alkaline or acidic process streams.

Parts Included List

This comprehensive kit includes all the vital flexible sealing components and O-rings required to perform a full fluid-end overhaul on the larger 2-1/2" valve body. It consists of the following factory schematic item numbers:

• Item 3 – EPDM Valve Disc (1075181 / 526-J)

• Item 6 (Quantity 2) – EPDM O-RING, 2-148 (1071738 / ORE-148)

• Item 9  – Buna Diaphragm (1075177 / 526-FB)

• Item 13 (Quantity 4) – EPDM O-RING, 2-018 (1071673 / ORE-018)

• Item 14 – EPDM O-RING, 2-214 (1010140 / ORE-214)

Key Features & Benefits

• Resilient EPDM Formulation: Formulated specifically for exceptional longevity in hot and cold water cycles, displaying superior resistance to weathering, ozone, and typical water treatment chemicals.

• Includes 526-FB Diaphragm: Features the genuine 1075177 reinforced elastomer membrane, built to withstand continuous industrial cycling.

• Perfect 2-1/2" Geometry: Precision-moulded to match the exact internal dimensions and sealing ridges of the large-format AqMatic / Pentair K526 composite valve series.

• Prevents Costly Downtime: Replacing these critical wearable parts during scheduled preventative maintenance prevents abrupt diaphragm ruptures or pressure drop failures.

Technical Specifications

Target Applications

The K526 series valves are typically deployed in high-flow, commercial, and industrial water purification setups. The K526-RA EPDM kit is an essential stock item for servicing:

• Large-scale commercial water softeners and multi-media filtration plants.

• Pre-treatment filtration arrays for industrial Reverse Osmosis (RO) networks.

• Municipal water conditioning and commercial boiler feed water loops.

Service Tech Tip: Before installing the new EPDM components, ensure the valve body and internal structural stack are completely clean and free of scale, mineral build-up, or debris. Take care when positioning the large 1075177 diaphragm to ensure it sits flat in the body flange groove before uniformly cross-torquing the cap bolts to factory specifications. If lubrication is required on static O-rings, always use an approved, non-petroleum based silicone lubricant to prevent damaging the EPDM material.