The main point Swix was making is that u should use the best hose u can get your hands on. Dont settle for simple clear PVC tubing from the hardware as that shit LOOKS good; but ends up warping and collapsing at any useful temperature. So goto your favourite tubing store and get the best u can afford; proper vacuum tubing would be ideal for the connection from the aspirator to the glassware, and high pressure fluid tubing is best for the water connections.
It is recommended that u get the best fitting tubing that u can just squeeze over the aspirator fittings. Then secure with quality hose clamps. U can seal with glues etc - but then it makes cleaning, maintenence, and replacement of parts difficult.
IN SHORT - take the aspirator into a decent hose store, and say 'this bit has cold high pressure water flowing through, this bit will be under vacuum and subject to heat, and it needs to clamp up tight'. The dude will go, this bit for here, this bit for that etc. Hand him the cash and leave. If he asks questions, its for your hippy aromatherapy hobby, or you're an inventor or some bs. Swix finds they shut up when they ask shit and u say, 'its a water-aspirator to create a vacuum', and they say 'cool mate' - then they are out of ideas.
Simple Simon