Approval of the types of marine toilets referred to above in section 657.2 of this Part shall be granted by the department on receipt of a certification from a laboratory which is currently and customarily engaged in the examination, testing and evaluation of such marine toilet or like device and which maintains adequate staff and facilities to perform such functions and which certification states that said marine toilet has been tested by it and meets the respective minimum safety standard set forth in section 657.3 of this Part. Every such type of marine toilet, which is offered for sale, sold or used on any watercraft, in this State, shall bear an inscription, permanent tag or other permanent writing stating that the said marine toilet which has been previously tested, meets the safety standards set forth in section 657.3 and has been approved by the department.