That makes sense. If the hose manufacturer did have proper and highly visible warnings and even against the very brand and model of mower washer the guy used, then the mower owner should be liable for his/her own actions. I know the hose manufacturer would still be dragged in and their insurance sued. But hopefully the lawyers would be the only ones getting rich, and not the mower owner.

Say the mower washer was not actually a mower washer but some sort of irrigation equipment of some kind. Some guy that is tired of washing his mower deck sees the thing working on a farm somewhere and finds out where he can get one. Buys it and hooks it to a hose and uses it for washing the underside of his mower deck and it works absolutely awesome. He gets excited enough about it that he tells some of his friends and they all go buy it. Then he posts it on facebook how well it works and someone on facebook messes it up buy using it under a larger or smaller mower or something like that, and the hose gets caught up and take his/her arm in like you mention. Is the guy that posted his discovery on facebook liable? And since the irrigation equipment had never been used for such a situation, there could be no warning for it...yet. The hose manufacturer still dont know what the irrigation piece is so it would be impossible to warn against it...yet. So I wonder if at the end of the day, the person taking the idea from facebook and getting injured would be the one left with his/her own liability?