Never heard of them. I did once live in an apartment that had no vent to the outside for our dryer. It vented right into our living space. The complex gave us this odd bucket that hooked onto the end of the hose, there was a reservoir at the bottom for water. It sucked, so I took it off and put cheap nylons over the end of the hose instead. Just changed the nylon after every 3rd load or so.