I can't find one locally, so am considering building my own, its needed to siphon out horse water tubs for cleaning. They are 20 gallon and a bit too heavy these days to drag around. I'm thinking a PVC shaft with a flapper valve at the bottom, a second flapper valve at a 'side mounted T'. The suction plunger will be turned wood with an 'O' ring, the plunger handle a threaded rod. The side mounted T will be placed slightly above the tubs rim, a drain hose attached to remove the water safely out of the horse stall. In the past here the horse attendants just dumped the water tubs into the stalls, and they wondered why there was so much hoof problems.