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Teflon tape acts to lubricate the threads and will allow you to screw together fittings tighter (without applying additional force). This is true with metal and plastic fittings. It also acts to seal the fittings if there are irregularities in the threads.
When people talk about leaking bulkheads the typical question that comes up is the pro's and con's of using silicone on the bulkheads when you install them.
Blue
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200g tank w/ SD dsb, ~150 lbs LR, 2 Maxijet 1200, 2 x 400w MH, 2 x 165w act blue; 55g refug. w/ dsb, grape and razor, NO 40w on 12 hrs, Minijet 404; 44g rubbermaid sump.
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