Only problem I had was the small part . The airline tubing holders are small.I don't see the problem as some reviews. One being a square peg in a round hole thing.I think it's designed like that to make a more secure connection? Why not a one piece? Who knows...got 2 different type from different manufactures, both seem good enough to rate 5.I have large Oscars and being the dogs they are, one of these suction cups went into the tank unsecured. One Dog ate it and became lodged in his mouth. (180 gallon tank). Diving for my Oscar, netted him, jumped out of the net, picked him up and secured him. Got tweezers, and gently performed an extraction. Oscar was traumatized for an hour, now doing well.There would have been a problem, but the suction cup was not completely over the tube.Other than that, they are perfect for keeping the lines down and out out of the way.
Rating: [5 of 5 Stars!]