It is unlawful for any person to complete, enclose, cover up or place in use any water service, sewer service, or any other serv ice in connection with which there is any plumbing without having given the plumbing inspector notice that the work is ready for inspection and until the plumbing inspector has inspected and approved the same – provided, that the plumbing inspector shall make such inspection within twenty four hours (Saturdays, Sundays and holidays excepted) after receiving notice that the work is ready for inspection – and provided further, that all subsequent inspections made necessary because of disapproval by the plumbing inspector of repairs or installations as submitted shall be made upon a similar notice and within the same time as provided in this section.