33 C.F.R. § 159.65 Chemical level indicator.
Title 33 - Navigation and Navigable Waters
The device must be equipped with one of the following: (a) A means of indicating the amount in the device of any chemical that is necessary for its effective operation. (b) A means of indicating when chemicals must be added for the proper continued operation of the device.
Title 33: Navigation and Navigable Waters
PART 159—MARINE SANITATION DEVICES
Subpart C—Design, Construction, and Testing
§ 159.65 Chemical level indicator.
