bulkhead problem

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cpm6t

Gambusia
MFK Member
Nov 8, 2011
577
7
18
Sri Lanka
I'm getting a tank built using 12mm glass.
I want it drilled on the side to have an outflow to the sump. The problem is I'm unable to find a bulkhead that has threads long enough to go though the 12mm glass. Any ideas how I can tackle this please?

I do not like the siphon thing to get flow out.
 
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