Whip out the ruler, measure the hole diameter, and use these BRS ABS bulkhead measurements down below as a guide...
Bulkheads are used to attach plumbing to aquariums and sumps to allow water to flow through them. These low profile reef safe bulkheads are made from black ABS plastic. Our supplier manufactures these slightly thicker than competitor aquarium bulkheads making them more reliable. Bulkheads come...
www.bulkreefsupply.com