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It's a good unit. I've been running one on my truck for about a year now as a test. A few extra fittings will be required to install it. I'm still partial to the Evans unit though, although I have several spares of both.

Try these 2 part numbers at your local Cat house. I haven't had time to fully reassemble and test my spare with these installed but test fitting felt real good. The larger one is $5 and the smaller one is less than a buck. You'll need 2 of the smaller one. Using multiple O-rings to determine...

The parts in my picture are from my spare. It has the plastic plunger. The one in my truck has the brass plunger. The brass plunger has an O-ring that seals the hole, which is replaceable. I agree that the brass is a better design than the plastic.

There is an O-ring behind the jam nut on the thermal capsule end. If that fails it will pressurize your cooling system and cause problems. There is also a spring loaded sliding tube on that end that needs to move freely. Best to remove it completely and service both ends. As said above, just...