33 C.F.R. § 183.556 Plugs and fittings.
Title 33 - Navigation and Navigable Waters
(a) A fuel system must not have a fitting for draining fuel. (b) A plug used to service the fuel filter or strainer must have a tapered pipethread or be a screw type fitted with a locking device other than a split lock washer.
Title 33: Navigation and Navigable Waters
PART 183—BOATS AND ASSOCIATED EQUIPMENT
Subpart J—Fuel Systems
Manufacturer Requirements
§ 183.556 Plugs and fittings.
