The Eaton Fuller Piston O-Ring, part number 16660, is a genuine Eaton Fuller sealing component used in differential housing applications. This O-ring measures 2.5 in. x 2.5 in. with a 0.11 in. profile, making it a direct-fit replacement for the original piston sealing position. Sold by Pro Gear and Transmission. Call us to confirm proper fit for your specific application before ordering.Interchanges:02-709138016660-SP690264D4HZ7288BFUL-16660ZBF16660Mack 3088-16660FeaturesGenuine Eaton Fuller part number 16660Differential housing piston O-ring applicationDimensions: 2.5 in. x 2.5 in., 0.11 in. profileSold individually (each)Tech SpecsPart Number: 16660Part Type: Piston O-Ring, Differential HousingDimensions: 2.5 in. x 2.5 in. (H: 0.11 in.)Unit of Measure: EachUsed in this Eaton Fuller modelRT-6613 / RTO-6613