You should never drill a tempered tank.....who knew, We figure I've drilled over 40 tanks. My first blowout 46-1. I drilled another 55 right after this.
If you look at the tank at an angle in sunlight you will see striations on the glass pane, this means it is tempered. If there are no striations it is not tempered. Much easier to to see them once you've know what to look for.
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