If installed right they work great, on a hydro, install ONE on the lower LEFT side of transom...Cats, TWO, one in each sponson centered at the bottom, monos, ONE just about anyplace you can find room as close to the lowest point as you can get, usually just to the LEFT of the strut.....I dont glue any of mine in I figure out where They need to be placed, drill the hole smaller than the bailer and file to fit tight with a round file.....Get as close to the bottom of the hull as possible!!
Here is a picture of my sport 40 autobailer installed, the autobailer has been cut down to just before the o-ring on the inside flush fit to the rear of the transom.....


here is one of my cat (yes it is dusty)

hope this helps you out