This flexible schedule 40 PVC pipe is the thing to use for running your plumbing outside the pond. It is very strong and easy to work with. Installation is easier when you can run your pipe easily around obstructions. Saves you money when compared to using straight pipe and elbows. Flexible PVC will take standard schedule 40 PVC connections. It is solvent welded (uses PVC cement) into fittings. It will provide maximum water flow by reducing friction which normally would occur through elbows in conventional PVC pipe.