I got my boat out of the shrink wrap a couple weeks ago, installed the batteries and cleaned her up getting her ready for the season and while I was down in the engine compartment I found a blue plug that was laying there on the bottom.....it screwed in up by the exhaust on the starboard engine. Now I assume that it was a drain plug to get the excess water out for winterizing. I had a local company winterize it and shrink wrap it. Anyway I found the hole and screwed the plug back in. My dilemma is that I have twins and the other engine doesn't seem to have this plug. There wasn't another one laying anywhere and from what I could see there wasn't another hole or a plug anywhere in the other engine. Now the engine with the plug was a newly installed engine last season and the other engine is the orginal from 94.......is it possible that only the new engine has this plug ? Thanks for the help in advance. I know I'm an idiot when it comes to this stuff, that's why I ask.

My '94 boat didn't have the blue drains. My '99 does.

I always refer to BAMS mercruiserparts.com for part diagrams and numbers whenever I have a question about motors and drives. Might look up your specific motors to be sure.

Many times the threads of the plug will break off inside the elbow. I keep several on hand just for that reason.

Blue Drain Plugs are located at the port and star side of each engine Mid block also on the raw water pumps and coolers if equipt