Mich. Comp. Laws § 123.321: Tank disposal facilities maintained by gas station; installation of lock; use of facilities.

Sec. 1.

A person, firm, or corporation operating a gas station which maintains tank disposal facilities for trailers, campers, or other recreation or travel vehicles, which facilities are connected directly with sewer systems, shall install a lock on the facilities and permit the use of the facilities only upon the permission of the manager or attendant in charge of the premises.