Its a bizarre design but that is how they come from the factory. The bulge appears to be the stop for the rubber as opposed to the 'not popping out' arrangement you'd typically see on a hose. The metal clips should hold them in place so they can't move under pressure. The right angle piece where the flexible hose joins on to the scuttle has a cable tie round it to hold it to the plastic pipe, but that's the only one that does.
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