I have since change that arrangement a little to turn the pump upright, as the Henderson pump for the Lavac head does not work well on its side. The clear tube is PVC schedule 40 heat formed by me to fit. I used that trick in several places to tidy up the pumping. You have to turn the ends (or the whole length) of 1 1/4 pipe to make it fit 1 1/2 hose - it comes about 1.66" OD. The clear PVC lets you see what you had for dinner .