External pond filters use screw connections on their inlet and outlet fittings to connect with flexible pond plumbing. Inside these fittings, an O-ring (gasket) is essential for creating a watertight seal and preventing leaks. Over time, O-rings can wear, flatten, or snap, so keeping a few spares on hand ensures your filter continues running smoothly without interruption.

Compatibility

Fits larger discontinued Filtoclear models: 16000, 20000, 30000
Fits new generation Filtoclear models: 5000, 13000, 19000, 31000
Can also be used with other pond filter brands that have 50mm connections

We stock a wide range of pond filter spares, including replacement parts for Filtoclear and other major filter brands. Keeping a few extra O-rings on hand saves headaches later on.

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