Adjustable-Height Urinal

Urinals have the problem of never being at quite the right height; splashback, up-aiming, or floor-level drains are all problems connected with the jiggers.

So make them adjustable.

A moderately-standard urinal would be mounted onto a hydraulic pump, similar to those which raise and lower barbers' chairs. A few light foot pushes (as urinals weigh less than you or I) would raise the urinal or lower it to the desired height.

To prevent forward tippage, this would be connected to a rail on the wall.

Water and waste would flow through flexible rubber hoses, so that movement doesn't do things like bend pipes.

Note: While not widely known to exist, a US patent has been issued for an adustable-height urinal, with height set by the user using a cylinder that is powered by the water flowing therein. It's an exceptionally-complex design (it's got a rotating cam!). This, I think, is different enough that it's worthy of its own spot.