Hi, Different people have differing learning styles. It becomes apparent after reading posts over a period of time, the lack of plumbing physics shown by some. Makes me wonder how they operate? Any body wishing to become a plumber wants to solder pipes, bend pipe etc. These skills were sufficient in days gone by, where a structure existed. Formen (plumbing technician) would instruct the plumber on the job requirements and check on completion. With the self employed plumber no validation of the works takes place. And a far greater knowledge of hydrostatics / hydrolics to name just two of many need to be understood. This understanding make the job so much easier. And gives the client confidence in the plumber if able to explain why prior to ripping the system to bits and disappearing when things get tough.