Help identifying part-gctid806401

[SaltyBones]

The part that the petcock screws into is cracked and leaking. I have no idea what this thing is or does.

This is a pic of a 2010 Mercury 5.0 MPI btw

Edit: Appears to be the water distribution housing, but I still don't know what it does other than obviously distribute water somehow..

[Pcpete]

Well, that's an interesting thingamajig you have there. Its called a water distribution housing and I sure hope it's the plug or Oring that's cracked. Worse if you have closed cooling. Here's the link I found. Take the part number and go shopping if that's gone bad.

http://www.mercruiserparts.com/bam/s...1855/15322/280

As with a Merc stuff, you need your serial number because they change things on that basis not year or model name.