I do believe that's a European keg. No American kegs have that. The stem screens into the opening as opposed to the American kegs which has a snap ring
I can build any sort of custom Tap tower for whatever your needs are. This one is 4" ss, 18 holes and has a 4 foot access panel. Message me for pricing
Miller max star 150 stl w/ a duel regulator for back purging. A perfect fit up is key for a good fusion weld. I like to place my fitting on the keg wall, not set in at all. I get a way more consistent weld this way, with far less room for error.