$7
About this item Compatible with APEC Essence and Ultimate reverse osmosis systems and also can be used on other 10″ standard sized filter housings. Made of high quality nitrile rubber that is flexible and resistant to abrasion and tearing. Lightweight and super flexible construction allows o-rings to be easily installed and unloaded. Durable and not easy to break. The dimensions of these o-rings are 3.5″ OD. We recommend replacing the o-ring every 1-2 years. We recommend using the product with a food grade lubricant for a better seal.
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