OPinions Flexble PVC Piping

I have used the 2" black flex a couple of times in koi ponds and it always held up great for many years. As Isaac says it is generally frowned upon here at TFP. The worst thing I have seen with the flex is that it can collapse on the suction side between skimmers and pump and it has to be dug up and replaced. But, I have only seen a few instances of catastrophic failures of flex PVC.
 
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