Any person licensed under section 14-319 to dispense motor fuel for sale to the public for any motor vehicle, as defined in section 14-1, shall provide for free public use an air compressor for the purpose of tire inflation during the hours such premises are open for business. Each such licensee shall post a sign in a conspicuous location upon the premises and in such form as the commissioner may require, informing the public of the availability of an air compressor for free public use during the hours such premises are open. Such compressor shall be capable of producing at least eighty pounds per square inch pressure at the outlet.