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https://www.swelluk.com:443/swell-pressure-filter-deluxe-quartz-sleeve/ 
Swell Pressure Filter Deluxe Quartz Sleeve
Quartz Sleeve for the Swell Pressure Filter Deluxe Range, so you can replace broken or cracked sleeves.
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Product Information
These Quartz Sleeves are designed specifically to replace those within the Swell Pressure Filter Deluxe range, the 8000 - 17000 models.
These sleeves are the best quality glass, and are designed for the UVC bulbs to work at their optimum level. As with all quartz sleeves, try to limit handling as much as possible to avoid damage.