Thanks for the replies, so far.
DD - This morning I began serching the web to check your suggestion. There's 'millions' of the bl**** things and I didn't actually have the concentration to plough through till I found anything small, or cheap.
Franky - I hadn't thought to look at your idea, but I'll peek tomorrow.
hip - I do intend leaving the line-cleaner in the pipes, if I can get it in. I can't even spell "peristaltic" but I promise to look - does this equipment 'suck' or 'blow'? It may be closer to what I'm after. Your bicycle pump idea is one I'd given thought to, but using a car-tyre pump (one of those upright ones) instead. Something like the pump I used as a kid to collect sandworms as bait for fishing.
Actually, sucking, blowing, or pumping will be a useful adjunct to my new exercise regime.
