Tank-Gas-6.6Gal-25L Trad EPA All Quicksilver tanks meet ABYC, CSA, & UL standards. High strength blow molded construction with protection against UV exposure and aging to help prevent fading and keep plastic pliable for longer life."Standard" tanks are furnished with 1/4"-18 threaded fuel line fitting and a manual venting cap."Premium" tanks include a 1/4" NPT threaded fuel line opening, a mechanical fuel gauge and top vented fuel cap.