David has been in the plumbing industry since 1988. He has a Certificate 4 in plumbing technology and is an Independent certifier in the 4 classes of work; sanitary plumbing, drainage, gasfitting and LPG fitting.•Restricted electrical work licence No. 61665•Plumbing Industry Council licence No. 21750•Drainer’s license No. P21750•Queensland building and construction commission contractors licence number No. 1061210•Gas work licence number No. L50180