I see. And yeah, I would have to ask them about making it a male GonG and not female.
Yeah, you can't use that "adapter", at least not in any practical way. It's a segment for their "Assassin" line of modular bongs. Those joints are big 38mm ones (or 50mm?), so even if they were the right combination of male and female it'd still be a no go. You'd need appropriate 38mm to 18mm adapters on each end, in addition to the cost of the piece, plus you'd end up with a teetering tower of glass like two feet tall.
You
could try contacting a blower for a solution, though. You'd get something far more compact and I bet a lot cheaper, too. Just a couple inches or so of 50mm tube, with a dewar 18mm female in the bottom (with a cap on top of the joint and ventilation picked/cut into the sides of the cap), and an 18mm male in top, and you're good to go.
If, like me, you live in a place with no local blowers, try talking to Jhanpixel here, or Andy from Colie on his iOffer page. Or even GBD, I guess, but if you're outside the US they aren't interested.