I will try to explain but i realise i will probably piss off some people . plumbing can be very complicated, you really need to concentrate and analyzed several factors before you install one inch. So you are installing water piping, drainage piping, natural gas or oil piping . and heating piping , and smoke pipe . All without conflict. and some yo yo is cranking out rap music next to your. You can not think right . that is what i mean.So, you think this is a job site and what do 4 plumbing licences have to do with music?