Pressure-activated petrol tap for scooters with Chinese-made, Minarelli-based engines (1E40QMB) such as CPI, Keeway etc. A petrol tap failure can often lead to starting difficulties and cut-outs whilst riding. When the membrane is stuck, either no, or not enough, fuel passes through. To remedy this you need to change the whole tap. Please compare this version with the factory-fitted one; this item has a long inlet tube.