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Thanks, that's a useful suggestion for a more permanent fix than I have just now. When faced with failures that need to be fixed quickly I probably err on the side of replacing like for like, rather than thinking about whether there's a better solution.

Thanks all. I wanted to get the water back on to do the washing up before going home so I ended up in Halfords as Midland was closed. 16mm seems a tiny bit too large, but OK for the moment while I see if I can find something a fraction smaller. The next size down from online suppliers I've looked at is 12.7 or 13mm which I think might be difficult to fit.

My old water pump started leaking yesterday, so I replaced it today with a Jabsco with a slightly higher pressure than the old one (25psi rather than 20). This has resulted in a pinhole leak in a reinforced black hose in my cassette installation. It runs about a foot from what looks like a non return valve into the back of the cassette mount where it links to a PVC hose that supplies the flush. As best I can measure it seems to be 21mm OD pushed over 17mm brass fittings. Photos below: Is there any particular type of hose that I should be looking for as a replacement - also I am not readily finding water hose of this size, so a supplier would be useful?

Thanks, it didn't look quite right when I copied and pasted from a previous post.

Given the number of potential variables involved in who picks up an infection and who doesn't, and whether any particular countermeasure mitigates it, I suspect this would need a very large and expensive trial. I doubt anyone would fund this. It seems obvious that it's undesirable to have waste getting into watercourses, and also obvious that the costs of changing the (now privately owned) infrastructure to do something about it would be huge. Stories of post immersion illness have been numerous and sometimes high profile (e.g. Walliams in the Thames) but until a suitably large numbers of bodies pile up I doubt action will be taken. That seems to leave individuals to manage their own risk. Where have I heard that before. 🙃 The proper answer to the hazard for an organised venue like HolmePier Pont is to check water quality regularly, and monitor for incidence of disease in competitors, which they now seem to do: https://britishcanoeingevents.org.uk/freestyle2022/water-quality/

The hydrochloric acid in the stomach tends to bring stomach contents to that sort of pH anyway.