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So on a FB page people claim to use these as bulk heads with flat rubber washers or silicone. Cheaper than buying a bulk head from the LFS.
What do you think would you use these or not?
I have 3 or 4 1" bulkheads (threaded) if you need em, think one or two has the overflow cage piece as well. If not, if anyone else needs them, let me know.
I will agree that this is not a part of a tank where trying to be creative with the cheapest you idea you can think of is not worth the risk. Even a $10 bulkhead is probably one of the cheapest and most important things in a system relative to overall costs of any tank anyways.