They are expensive. I made a great one with 3/8 home depot hex bolt I drilled out and cut the head off and installed it into a hose sweeper I bought at walmart. The only thing you do with the sweeper is drill out the small hole until it opens up to the 3/8th size. Then epoxy the drilled out bolt into the sweeper attachment with J/B weld. Works fantastic. The sweeper even has a water on/off valve. Total cost was $3.00 and change. Check the flush hole thread size first but mine was just a standard 3/8 thread.
