I like quadra bubblers where I want drip as they go on regular PVC pipe. I hate poly pipe as it is so fragile, and then lets dirt into the system (after the filter...) But I have a hard time getting the QB tubing to stay put. We install them with the clamps, but they STILL slide off. Not all, but too many. Too bad they don't use barbed nipples for the 1/4" tubing. I am considering GLUEING the things on, but thought I would ask if anyone here has a better idea?