Hole location for Herbie for overflow's

[Palmer]

Originally Posted by The Codfather

I think a 1" bulkhead requires a 1 3/4" hole.
I might be mistaken but I think you need at least 1xdiameter from the edge.
Don't take this as law, it's just off the top of my head.

These are the bulkheads I am planning on using.

http://www.bulkreefsupply.com/store/...-x-thread.html

Looks like its greater than 1.5 " for this bulkhead its listed as 42 mm. That is the size of the diamond hole saw I ordered.

I was thinking of going at least that much out (1") just to be safe. Makes sense...