I need to design a recirculation return for my Sanke MLT. I really don't need anything as elaborate as a sparge arm, and I'm leaning heavily towards just laying the silicone hose on top of the grain bed. I did this with a rectangular cooler, and turned-up the end in the corner. Since the keg has no corners, I'm not sure how I can keep the output from tunneling into the grain bed. The blichman sparge-arm has a little foam collar that keeps the end floating at the right level. Where can I get one of these collars?