I designed these tanks 14 yrs ago for the Yamaha nytro, known for oil tanks cracking, mounts breaking, tank punctures an even worse engine failures. All our HD oil tanks are built from .120 thick 5052 aluminum, internally baffled like stock tank, CNC fittings, fully tig welded and pressure tested. This tank come standard with 12mm drain plugs that will accept a quick drain. included is 12mm drain plug and  seal washer, I have sold hundreds of Nytro HD,YXZ and XX oil tanks with zero failures. Free Shipping to the lower 48 states, please contact me for shipping quote elsewhere.