Well, this isn’t much of a trick, but it’s been a useful way of dealing with various tubing size problems. It can be used with both tube luges and tray drainage tubing. Just don’t mix up the tubing or a guest might end up with a rather unpleasant martini.
    Generally you can easily find two types of useful clear tubing at Home Depot or Lowes: the blue label (5/8” outside diameter (OD) & 1/2” inside diameter (ID)) or the yellow label (1/2” OD & 3/8 ID.) Both of these are intended for use with food and drinking water; just make sure that you clean them out, just in case. Well, if you don’t have enough of one kind of tubing, but you have plenty of the other, you can make an adapter out of the one that you don’t have much of so that you can use the one that you have plenty of. To rephrase this: the yellow tubing makes a tight fit inside the blue tubing. Each can be used as an adapter for the other.

    If you’d like to use the yellow label tubing for a luge, then you might have trouble fitting a funnel to it because the tubing is too small. You can use a short length of the blue label tubing as an adapter to fit the funnel to the yellow tubing.