Cant find this part in 2GM20F service manual, what is it?

Apr 28, 2020
5
Pearson 33-2 City Island
Hi there, anyone knows what this thing is and what it does. Going to change out the exhaust outlet and mixing elbow this winter, but this thing in the cirle coesnt look super great either and would like to do something about it, but .... have no idea what it is. :)
 

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Nov 6, 2006
9,885
Hunter 34 Mandeville Louisiana
That one (part number 129670-49290) doesn't look bad. There is some corrosion on the piece that is is screwed into, the bundle cover.. It appears to be upside down with the handle on the bottom, but if you the turn the little handle 90 degrees it will drain the heatex bundle.. There is usually a piece of clear tubing on the valve so the water goes into the bilge instead of splashing on stuff ..You can see it in this picture right above the engine lifting loop.
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