Pre drilled tank odd diameter hole

[Anubis220]

I recently purchased a pre-drilled tank. I believe it was a DIY project for someone. There are two drilled holes, the bigger one is 1 inch in diameter and I found a bulkhead. The smaller hole is 1/2 inch in diameter and I can’t seem to find anything that will properly fit and seal to prevent leaking. This is my first drilled tank. I thought it would just use normal available pvc fittings. Has anyone else encountered this or have any suggestions

Thanks!

 

[HUKIT]

I don’t know what you’re trying to do with the tank. Either you can seal them using glass and silicone on the inside to cover the holes but if you’re looking to use bulkheads I’d personally drill both of the holes to a larger diameter depending on what size plumbing you’re going to use.

How To Select and Properly Install Aquarium Bulkheads

Bulkheads allow you to transfer water from one side of an aquarium to the other and allow for traditional PVC plumbing to be connected. In most aquariums, bulkheads are used for drain and return pipes on your display tank but can be used for many other things too. Some tanks come pre-drilled for...

www.bulkreefsupply.com

 

[wednesday13]

I recently purchased a pre-drilled tank. I believe it was a DIY project for someone. There are two drilled holes, the bigger one is 1 inch in diameter and I found a bulkhead. The smaller hole is 1/2 inch in diameter and I can’t seem to find anything that will properly fit and seal to prevent leaking. This is my first drilled tank. I thought it would just use normal available pvc fittings. Has anyone else encountered this or have any suggestions

Thanks!

Id guess it was for 1/4” tubing. Possibly for a float switch for auto top off or autodrip system. The 1” hole should fit 3/8” tubing. Those are awful tiny to serve much of any practical purpose. Was it a saltwater tank? I cant think of anything else but a float switch or something for dosing. They do make bulkheads that small in brass and plastic.