Check fitment before purchasing. 17-815111 has 1 in stock and 17-815111Q02 has 18 in stock. The 17-815111Q02 is the newer part number for 17-815111. Works on some Mariner Outboards - 2.5 & 3.3. Mercury Outboards - 2.0, 2.2, 2.5, 3 & 3.3.