a. It shall be unlawful for any person to distribute, sell, offer for sale, import or install any plumbing fixture which does not meet the standards of subdivision P.104.2 of section P.104.0 of reference standard RS sixteen.
b. An owner who has installed a shower head in a class A dwelling unit which meets the standards of subdivision P.104.2 of section P.104.0 of reference standard RS sixteen shall not be required to replace any such device which is stolen, removed, missing or rendered inoperable during the occupancy of such dwelling unit but shall replace such device prior to the commencement of a new occupancy of such dwelling unit. Notwithstanding the provisions of section 27-2005, it shall be the sole duty of the occupant of each dwelling unit in a class A multiple dwelling in which such a shower head has been provided and installed by the owner to replace such devices which are either stolen, removed, missing or rendered inoperable during the occupancy of such dwelling unit. The meaning of terms used in this subdivision shall be as defined in chapter two of title twenty-seven of this code.