may sound like a stupid question but...

[Sgt Jonny Cat]

Hi everyone, I have my 150 gallon dual overflow tank that I'm building. I bought it off craigslist, and it did not come with any bulkheads. My question is, does anyone know what size the holes are in the bottom of the tank? I ask because I want to start plumbing and I'm not sure what bulkheads I need. (I'm doing 1 inch returns and 1 1/4 inch drains)

 

[Smokey Stover]

Do you have a tape measure,ruler, cheap harbor freight caliper? If not get one of each lol.

 

[lapin]

We dont know who drilled them or who made the tank. You need to measure the holes. Then look up bulkheads online and see what size holes they require.

 

[Sgt Jonny Cat]

Ok thanks guys I figured that's what the answer was going to be. I'm guessing they must be around an inch or inch and a half but measure I will do...

 

[mcgyvr]

Don't guess.. measure accurately..
enjoy..

 

[Icewing726]

Grab a piece of paper and mark the length using the edge and your finger. Then measure that.

Probably an inch.

 

[Member No. 1]

A 1" dia hole does not mean it's a 1" bulkhead.
Same goes for 1¼ and 1½

You need to measure your holes accurately first, then look at a bulkhead sizing chart to determine the correct one.