Beautifully CNC Machined Fuel Tank cap. Comes with CNC Machined 6061 Aluminum Male or Female Adapter That Fits all 2'' Male or Female Threaded Tanks. Secured With any 5/16th's Shackle Diameter Padlock (not included). Adapters Have 'flats' Machined On To The Sides To Assist Tightening In To Tank. Gasket On The Inside Of The Cap Provides a Seal And prevents Spillage Of Tank Contents.