This summer my family bought our first boat and we are all loving it. We run our boat in mostly salt water and do not have any kind of flushing equipment. We cannot use muffs because the swim platform sticks out to far to reach the drives even when they are trimmed all the way up. I have been looking into installing a flushing attachments on the engines. I know that since we have alpha drives you can't let the impellers run dry so my flush attachment will include a dump valve to send the sea water overboard before it hits the engine. The problem I'm having is where exactly to install the attachment. I looked at the flow diagram and it looks like the water comes in from the sterndrive and through the power-steering cooler then the fuel cooler but then I can't tell. I'm pretty sure it doesn't go directly to the raw water pump on the engine. The engines a Merc 4.3L MPI. Does anybody know the best place to install the attachment?