This HDI Marine item is designed to connect risers together to gain height Fits the following engines: 1GM / 2GM / 2GM20 / 2GM20F / 1GM10 / 3GM30 / 3GM30F / 3HM30 / 3HM35F / 2GMF / 3HMF / YSM12 / YSE12 / YSB12 / YSM8 / YSB8 / 3GM10 / 2YM-15 / 3YM-30 / [...]