Got a call today from a guy who had some leaks. First was an easy one. Just replaced a 90 on a piece of ABS. Got to the second one and found a pipe I have never used in irrigation before. The first repairman had gotten a coupler and some hose clamps and joined the two pieces together but apparently it only lasted a few weeks. It was black flexible pipe and the guy with me called it polybutylene. I went to my store, picked up a coupler and some clamps got it on. Turned on the system and from the immediate rush of water it started to leak. Does anyone have any experience with this pipe and how to repair it?