I've never seen anything like this before...don't ask me how this thing works - you put cement, builder's mix and water into it, turn it on, and mere moments later it's transformed into pourable concrete! Just amazing...one of life's mysteries. It's finished all the jobs I needed it for, so now it's time to pass it on to a amaze a new owner. Perfect working order. The only defect is where a part of rubber has torn away (as pictured).