Sure, no reason not to.
An engineering degree in fluid dynamics would do the trick.
plumber
This depends on what material the plumber uses, what fittings the plumber uses, how much piping will be used and how long the plumber will take.
We have a leaky drain and I need to hire a plumber. How would I go about finding a qualified plumber?
You would take physics
You take a plumbing apprenticeship
A great start would be atrending a 5 year 10,000 hour apprenticeship with 744 hr class room studies and hands on experience and working uder the auspices f a Master plumber for a total of 7-10 years prior to taking your own masters exams.
Before calling in a plumber, it would be wise to try a product such as Liquid Plumber or Drano to unclog your sink drain. Many times it is just a matter of build up in the drain, and these products will take care of that. It is alot cheaper than callin in a plumber.
plumber
If you can't figure out how to fix it yourself I would recomend calling a plumber. They will be able to take care of everything.
stand a plumber and a pipefitter in a sewer in toilet water up to their necks. then take a bat and take a good swing at their heads. the one that ducks is a plumber.