Product Overview
Sierra Part #18-7163
O Ring Mercury Mariner Lower Unit Gearcase 18-7163, 25-33465, 25-822370 pack of 5-
O Ring Mercury Mariner Lower Unit Gearcase 18-7163, 25-33465, 25-822370 pack of 5 Manufactured by: Sierra Part # 18-7163 Set of 5. Replaces OEM part #25-33465, 25-822370 These o-rings can be used when redoing lower units. They work in 1972 Mercury 20 hp outboards. They may work in many other models also.