Ideally no. It depends on the fit of the bulkhead in the hole. The previous panel's hole was slightly larger than it needed to be so I put a tiny bead in the hole to fill the gap between the threads and the glass. (You're not supposed to put silicone under the overlap or the gasket though.). Anyhow that piece broke so there were a few tiny bits still stuck to the threads. I brushed it off as best I could but I guess I missed one tiny speck of it.
Ironically, the hole I had for 2" before was perfect and the hole for 1.5" slightly too large, this time around the hole for 1.5" is perfect and the 2" hole was slightly too large and required a tiny bit of silicone to prevent the bulkhead from shifting around in the hole.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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