Metric bulkheads

beastium · Jan 2, 2022

I have a tank with 37mm (1-7/16") and 30mm (just under 1-3/16") holes.
I can't seem to find metric bulkheads, and I'm wondering if I can use the next size down in imperial sized bulkheads without issue.

Any advice would be appreciated!

Water Dog · Jan 2, 2022

For the 37mm hole, you can use a 3/4” ABS bulkhead. For the 30mm hole, you can use a 1/2” ABS bulkhead.

For reference, see this BRS bulkhead sizing guide and it’s chart below...

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