The Pentair 152516 buttress thread closure O-ring is a replacement sealing gasket designed for Triton II and Tagelus pool and spa sand filter systems. This quad-seal style O-ring installs within the buttress thread closure assembly to create a watertight seal between the filter tank and closure components. It helps maintain proper filtration pressure while preventing water leaks during filter operation.

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Key Features

• Replacement buttress thread closure O-ring designed for compatible Pentair Triton II and Tagelus sand filter systems.
• Quad-seal design creates a secure watertight seal between the filter tank closure and internal filter components.
• Helps maintain proper system pressure while preventing water leaks around the filter dome closure.
• Durable rubber construction resists pool chemicals, compression wear, and filtration system operating conditions.
• Designed for use with buttress thread closure assemblies and valve adapter closures used on Triton II filters.
• Ideal replacement component when existing O-rings become flattened, cracked, or lose sealing integrity.

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Product Overview

The Pentair 152516 buttress thread closure O-ring is a critical sealing component used in Triton II and Tagelus pool and spa sand filters. Installed within the closure assembly, the O-ring forms the seal that prevents water from leaking between the filter tank and the closure or valve adapter components during filtration cycles.

This quad-seal style gasket features a square-profile design that improves sealing stability compared to traditional round O-rings. Its durable elastomer construction is engineered to withstand repeated compression, pool chemicals, and pressure fluctuations within sand filter systems. Replacing a worn closure O-ring helps restore leak-free operation and maintain proper filtration pressure in compatible Pentair sand filter installations.