Yamaha - Adaptor Cooling System Connection 6ES-48237-00-00. Overview. Adaptors are one of those parts you don't pay attention to-until something doesn't line up or seal right. When you're rigging or servicing Yamaha cooling systems, having the correct adaptor makes all the difference in keeping water flow where it needs to be. I've seen plenty of issues come from mismatched or worn connectors, especially in saltwater setups. Get this piece right, and the rest of the system tends to fall into pla