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https://www.swelluk.com:443/swell-pressure-filter-deluxe-o-rings/ 
Swell Pressure Filter Deluxe O Ring
Replacement O Rings for the Swell Pressure Filter Deluxe Filters, including the 8000, 12000 and 17000 models.
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Product Information
The O Ring is the rubber sealing ring that goes around the top of the filter to ensure a tight and correct fit. Over time the rubber on these will start to deteriorate, and can cause leaks, so may need replacing.
Swell have the correct size for each model of the Swell Pressure Filter Deluxe, so you can be sure to get the correct fit and ensure your filter will last much longer.