Bulkhead size for 25 gallon

[Tony25]

Im going to drill my 25 gallon and add a bulkhead. What size bulkhead would be good for this system. I can get a 1 inch diamond hole bit pretty cheap. What size bulkhead would fit this.

[BLKTANG]

IMO if your gonna drill 1 hole go with 1".

I just did my 20L,& did 2 3/4 " bulkheads.