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Replacement main seal ring for the motor head of the Finest-Filters HW-7 series or the APS EF and EF+ series canister filters. Please select your model from the drop-down menu when ordering. We have 3 sizes available: 1000l/h – Fits HW-702A, HW-702B, EF1000 and EF1000+. 1400l/h – Fits HW-703A, HW-703B, EF1400 and EF1400+. 2000l/h – Fits HW-704A, HW-704B, EF2000 and EF2000+ Replacement of the motor head seal ring often solves issues with filters leaking, and over time the seal ring may become dried out and crack, causing problems with the filter.