My wife and I were looking at a new house and I found existing leviton L6-20 receptacles in separate garage bays (an upper and a lower). These are the single, three prong twist locks. They are apparently both set on a pair of ganged 20 amp breakers, (at least thats the only ganged 20 amp breaker), marked "garage 240 v". All the other garage outlets are 5-15s but on single 20 amp breakers. This seems like an odd set up, but perhaps they were thinking no one would be welding in both bays at the same time ? Both are very long runs from the panel. There is also a 50 amp circuit to the upper garage, which had a 14-50, but it got reused for an AC / heatpump. A 240 v 20 amp circuit would be fine for charging my MR, but we're thinking of a Y eventually and that level of charging would be fine too, but not one car at a time. I can't really go back and take the panel apart at this stage, so I'm just more curious about possible solutions than anything. So two questions: 1.) Looks like a single circuit, can they both be used simultaneously ? I would sure guess: no. 2.) could I just swap the single L6 out for a single 6-20r or is there a l6-20 to 6-20 adapter that would allow me to use the umc ?