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Since 1999
Water Filter O-Ring - O.D. 90mm (3 3/4") I.D. 85mm (3 3/8") CS 5mm #o-ring-import-10 - HKF-1014WW
O-Ring - Be sure to use Dow 111 Silicone Sealant to help prevent leaks.
O-Rings
Kemflo KFHRO RO System
Kemflo RO-B-3 RO System