After using this coupler, everyday work is very easy and it is useful. Since the height of the conveying part is about 10 M, we use safety hazards by using 2 to 3 hose bands (though one piece may be good in the original) for attaching the coupler. There is not leak at all.
I can not complain so much because it is cheap, but suddenly I cut my finger suddenly as I locked the lever to try it. Perhaps it seems to be burr of the mold, but the corner of the lever tip is sharp like a razor. We use it by chamfering with a diamond file, but I am satisfied with no problem in terms of performance, but at the very least we would like to improve the manufacturer so that it will finish so as not to hurt at all.