X-Tech Probuild Fuel Dots, the best quality at a better price. These 'Dots' are a must with YS motors & most other brands of engines. Colour code your installation with two colours of tube (Green for vent & Red for fill) & you won't release the "wrong" dot & cover your flying buddies in fuel!! Fuel tube diameter is important, if you're stuck, we stock the perfect size tube for these dots.