Just get a water supply pipe from the plumbing section of your favorite h/w store. It will be a vinly line wrapped in SS mesh. Cut the ends off, pull out the tubing and roll&crimp the end. then you can use a hose clamp to attach it to your drain. You may also want to put a weight in the end to keep it from floating up. I used a titanium weight from my son's pinewood derby car. Just don't use a lead weight.