What size hole do I need to Drill

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eatsomepopcorn

Aquarium Advice Freak
Joined
Jan 12, 2010
Messages
278
Location
Michigan
I would like a tank with a 1 inch drain line and 3/4 inch return. What size should the tank be drilled?
 
You'll need to get a special diamond bit to cut the holes.

1" bulkhead fits into 1 3/4" (45mm) hole
3/4" bulkhead fits into 1 1/2" (39mm) hole
 
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