Application: Suitable for diesel, kerosene, and petrol below 90#. The slim design and balanced weight of the fueler make operation easy and labor-saving. Features high strength, light weight, wear resistance, corrosion resistance, and excellent sealing performance. The fueler includes a brightly colored plastic sheath for added comfort. The self-sealing fueler automatically shuts off when the container is full, providing modern support for metered fuel transfer. Ideal for unmanned fuel stations, it prevents oil or foam overflow, helps maintain station cleanliness, and reduces air pollution. Working principle: The nozzle contains a vacuum tube with a small hole. When the pressure lever is in the "on" position, liquid flow creates suction that draws air through the hole into the vacuum tube. As long as air flows through the tube, fuel continues to dispense. When the liquid level rises and covers the hole, air flow stops, triggering the automatic shut-off mechanism. Designed for use in factories, gas stations, and households. Features automatic shut-off when the tank is full, and is easy to clean, install, and maintain. Installation of the connector: (1) If the fueler inlet has a NPT (National Pipe Taper) threaded connection, use an appropriate sealant to ensure a tight seal. (2) If the fueler inlet has a BSPT (British Standard Pipe Taper) straight thread, a rubber O-ring must be used for sealing. (3) Carefully connect the fitting to the fueler inlet. Avoid over-tightening to prevent damage or cracking of the fueler body. Operation: (1) The fueler switch has three fixed flow settings, allowing refueling at different flow rates. (2) During refueling, when oil or foam covers the air hole at the nozzle tip, the fueler will automatically shut off. If spray or foam causes premature shut-off, adjust the flow rate or reposition the nozzle.