What drill bit size for a 1/2" brass pipe bulkhead in cooler?

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hezagenius

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My cooler doesn't have a spigot hole so I need to drill one. I have all the parts for a 1/2" bulkhead. I bought a 1/2" drill bit but this is clearly too small and I can't find the O.D. of the 1/2" brass nipple. It is a Watts A-836 1/2" x 1 1/2" brass nipple. Anyone know what size drill bit or hole cutter I need?
 
I'd recommend a 3/4" step bit [Harbor Freight]:

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