Pressure-activated petrol tap for 50cc Chinese scooters with plastic tanks (e.g. New models of the Rex RS and Peugeot V-Clic) and most Chinese 4-stroke scooter GY6 125-180cc engines. 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 item. Exact identification is not possible.