Yes or you can put air to the top and bottom ports on the gate with a compressor and see if it leaks thats the only failure i have ever seen on the knock offs is when someone takes it apart and they put it back together they pinched the diaphragm in it and it boosted to the moon they kept blaming the gate being a knock off and it was because the didnt pay attention to what they was doing when they put it back together.

And remember they are about 1000 of these knock off's floating around some look alike but they are made from about 1000 different manufactures so always inspect it real good before you go bolting it on if you use one of these , make sure everything is in working order and NO LEAKS.