This is one of those items that serves a dual purpose, the “marketed” one, and the “what people really use it for one”.It’s marketed usage which you can see in one somewhat misleading photos where they show the 50A end “plugged” into the camp pedestal and two RV’s plugged into the pigtail ends. The problem with that is that’s not what the genders on this adapter actually are..If it really was for this purpose, the 50A end would be a plug NEMA 14-50P, not the receptacle 14-50R that it is , and the 30A ends would be receptacles (TT-30R), not the TT-30P plugs that this has.However the actual configuration of this adapter’s genders make this a combiner, not a splitter, and the way it’s wired is the X (line) pin of the 14-50P goes to the unlabeled X (line) pin of one of the pigtails TT-30P and the Y (line) pin of the 14-50P goes to the other unlabeled X (line) pin of the other pigtail.What an adapter like this is used for is those cases where you have a shore power pedestal with a pair of TT-30R’s (30A) and no 14-50R (50A), where in you can plug into both of the 30A’s on the pedestal and feed that to the 50A RV.This does NOT come without safety caveats.First - This will not work at all if the pedestal’s TT30’s have GFCI’s. They’ll trip due to the delta across the neutral. Don’t even plug in.2nd, if they’re non GFCI receptacles and breakers, before one even plugs into these you’d need to break out a voltmeter and see how the parks 30R’s are wired up. Checking across the Line and Neutral (W) for each 30R should show 120V and checking across the two line (X)’s should show 240V across both legs of the panel if the outlets are wired into the breaker box correctly.In that case you could use this to feed two 30A lines to the 50A RV, (with caveats).However, If it shows 0V, then both these pedestals TT30’s are on the same phase of the AC, and that’s where problems can occur.The usual usage for this is if your RV has two air conditioners. Running a single 30A TT30R will usually only allow you to get one of the two A/C’s up and running as the inrush current draw from firing up both A/C’s will most often trip the breaker, depending on your RV’s A/C BTUs.TT30s can be wired with either #10 or #8 AWG. Ideally they should be #8 but with most campgrounds you never know and it’s very common for some of these lesser maintained places that they cheaped out and went with #10’s.When plugged into a 14-50R, even if your RV’s load is totally unbalanced between the two legs (say pulling all 50A off one phase and zero off the other) the current balances out via the neutral at the panel and the #6 on the 14-50 is rated for that.However when both TT30’s are on the same leg (and wired with #10 to boot), ALL of the load current will flow from both sides of RV breaker panel back to the campground panel which COULD Be 30A + 30A = 60A. That is above the rated capacity of the neutral line in both the cord and the wiring between the input on the RV and its breaker panel.So in the cases where both the TT30’s are on the same leg you need to manually ensure you’re never drawing more than 50A total from the TT30’s. If in the typical use case where you want to run two A/C’s, you’d need to make sure to shut one of them off before firing up a coffee pot, microwave, Water Heater (in AC vs Gas Mode) and the Refer (if it’s in AC mode vs Gas), as that additional load might get you over the 50A “adhere to” limit.Now the product info for this shows 10 AWG (and a 3750W rating) for the 30A ends and shows no info as to the 14-50R end, so I’m guessing it’s probably 10 AWG as well. I’d have preferred if they’d gone with 8AWG for this application. Provided you keep your loads balanced fairly well and don’t have more than a 30A difference in draw between the two legs you could run both your AC’s off it.So in short, this can very much serve a legit purpose, but you need to know what you’re doing with one.