Pentair | PEN152509Z | Pump/Filter Lid O-Ring | 8.5 In ID Seal

The Pentair PEN152509Z pump and filter lid O-ring is a replacement sealing gasket designed for pool and spa pump and filter lid assemblies with an 8.5-inch inside diameter. This square-profile O-ring creates a watertight seal between the lid and housing, helping maintain proper system pressure and prevent air or water leaks during operation. It is commonly used with Triton II, Triton C-3 sand filters and select Pentair pump systems.

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Key Features

• Replacement pump and filter lid O-ring designed for compatible Pentair filtration and pump systems.
• 8.5-inch inside diameter square-profile ring provides proper sealing for dome closure lids.
• Creates a watertight seal that helps maintain filter pressure and prevent air intrusion or leaks.
• Durable elastomer material resists pool chemicals, temperature changes, and repeated compression cycles.
• Commonly used with Triton II and Triton C-3 commercial sand filters and select Challenger high-flow pumps.
• Ideal replacement component when existing O-rings become flattened, cracked, or lose sealing integrity.

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Product Overview

The Pentair PEN152509Z pump/filter lid O-ring is a critical sealing component used in several Pentair filtration and pump systems. Installed in the lid groove of compatible pumps and filters, the O-ring forms a tight seal that prevents air and water leaks while maintaining the pressure required for proper filtration operation.

Designed with an 8.5-inch internal diameter and square-ring profile, this gasket is commonly used with Triton II and Triton C-3 commercial sand filters as well as certain Pentair high-flow pump models. The durable elastomer construction withstands pressure, chemical exposure, and regular equipment maintenance cycles, helping restore reliable sealing performance and maintain efficient pool circulation system operation.