The contractor model CM1 boot cleaner is based on our HM2 but integrates with a piece of 14 gage galvanized Grip-Strut grating for the base! Having the jet block & Scrusher attached to the grating, provides good evacuation of the mud & water through the grate. Making the contractor models even more efficient than the HM models. Tough enough for any application you can throw at it. Attach to a garden hose and you now have all the benefits of a industrial Boot Cleaner at your toe tips. Having the ball valve means you can leave the hose hooked up & faucet on, so it is ready whenever you need to clean the junk off your soles.