Bulk head size question

[nychris351]

I acquired a 250 gallon tank for free .. on the back wall it has a built in overflow and inside the overflow are two 3" holes ... can anyone tell me what size bulk head I would need for them ?

 

[ryeguyy84]

I believe that's a 2 inch. The 2 inch uses a 75mm bit which is about 3 inches.

Sent from my SM-G973U using Tapatalk