All glass aquarium bulkhead sizes

Northstar24

The Tang Herder
Does anyone know what size bulkhead fittings come with the all glass plumbing kit? One is smaller than the other. I used the larger ones on my drains and I need to replace the drain lines (long over due)

I'd measure the vinyl tubing on the current drain lines but it's hardened and deformed to the point that I can't get a decent measurement out of it
 
I know best fish carries both sizes. I'm guessing 1in? They also have the threaded exterior bulkheads that are for easy break down. Sorry, I don't know the mom's on them.
 
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