Section 53. Plumbing and drainage to be executed according to rules

The
  plumbing and drainage of all buildings, both public and private, in each
  of the cities of this state, shall be performed  by  persons  authorized
  under  the rules and regulations adopted by the local board of examining
  plumbers, in conjunction with the  board  of  health  for  plumbing  and
  drainage,  and  all  plumbing  and  drainage  work  shall be executed in
  compliance  with  such  rules  and  regulations.  And  all  repairs  and
  alterations  in  the  plumbing  and drainage of all buildings heretofore
  constructed shall also be performed and executed in accordance with such
  rules and regulations; but this section shall not be construed to repeal
  any existing provision of law  requiring  plans  for  the  plumbing  and
  drainage of new buildings to be filed with any local board of health and
  be  previously  approved  in  writing  by  such  board  of health and be
  executed in accordance therewith, except that in case  of  any  conflict
  with  such  plans,  rules and regulations of the board of examiners, the
  latter shall govern.