The Pentair 178746Z diamond seal kit is a replacement sealing component designed for Pentair pool and spa filtration systems. This 2.403-inch diamond seal installs inside union fittings to create a watertight connection between plumbing components. The durable rubber seal helps prevent leaks while maintaining proper system pressure and reliable filtration performance.

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Key Features

• Replacement 2.403-inch diamond seal designed for Pentair pool and spa filtration system unions.
• Creates a watertight seal between union fittings to prevent leaks in filter plumbing connections.
• Durable rubber construction resists pool chemicals, pressure, and environmental exposure.
• Helps maintain proper filtration pressure and reliable water circulation.
• Compatible with Pentair Clean & Clear RP, Posi-Clear RP, and separation tank union connections.
• Direct replacement seal designed for quick installation during filter maintenance or plumbing service.

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Product Overview

The Pentair 178746Z diamond seal kit is used in union connections within Pentair pool and spa filtration systems. Installed inside the union fitting, the seal forms the compression gasket that prevents water leaks where plumbing components join together.

Union fittings are commonly used on cartridge filters and separation tanks because they allow plumbing connections to be removed for service without cutting pipe. The diamond-shaped sealing surface helps maintain a tight connection under pressure while remaining easy to reinstall during maintenance. Replacing worn or damaged diamond seals helps restore leak-free plumbing connections and ensures reliable operation of the pool filtration system.