§ 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.