Hello I started my boat up for the first time this season and I noticed a drip coming off the bottom of the exhaust manifold. I took it off the boat to get a better look, and I noticted that the plug in the picture next to riser looked melted and there was little rust around it. I just a allen and pulled it out and sure looks like melted plastic pipe plug. The one on the other side looks brass. Are they both suppose to be brass? I looked at the parts diragram and they dont have parts numbers. Ive attached at pic to point out what im looking at.
