"O" ring thermostat housing ???

Wow... $134 bucks for something as stupid simple as a waterneck.... what a bargain! ... NOT

The Tony Parts housings...
Pricing should be other way around because the 'smoothed' one required an hour of tumbling in a grit barrel to remove the sharp casting edges...


Waternecks are all created 'flat'. They warp because some fo the designs/choice of materials suck.
Adding a simple groove on the base in the lathe is a 1 minute job and should fix 80% of the leakers out there I would think.