Bulkheads...

With acrylic I would use pliers but not too tight. With glass you only tighten them hand tight so the glass dont break, but with acrylic you should be OK
 
I made the mistake of tightening mine too hard. They began to leak and I had to cut them off to get new ones on. Its best to tighten them as litttle as possible so you can still tighten them harder if they leak.
 
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