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A930Rocket A930Rocket is offline
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Join Date: Oct 2003
Location: Mount Pleasant, South Carolina
Posts: 7,416
You're right, the sealing surfaces are concave and convex, but I've noticed that you can install the nuts and not have the pipes on squarely. With the nut "pulling" the pipe and seating surface up into the T-stat and the pipe at an angle, it might not be tightened properly. That's my thought anyway...

Originally Posted by JFairman View Post
I think those are compression fittings so the sealing surface on the inside area where they contact and seat together. They should be clean and dry with no tape or goop.
Teflon tape or permatex gasket sealer on the threads is for tapered threads like pipe thread fittings.

The threads on the thermostat body are aluminum and will gall and keep the fitting from tightening up good if there is no grease or lubricant on the threads.

Put anti seize on the threads or grease if none is around and retighten them.
Old 06-22-2010, 06:12 PM
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