There is no torque value as far as I know. There should be rubber washers to minmize the chance of cracking the ceramic and to provide a water seal.
But to try to give some sort of guideline, on a scale of 1 - 10, I'd say a 6 would be about right -- or perhaps you could call that medium tight. In any event, the bolts have to be tight enough to prevent leaking -- if it leaks, you'll have to keep tightening.
Charlie
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