Without the adapter, it can be used to inflate tires with a Schrader valve. When the Presta valve adapter is attached, it can be used to inflate tires with a Presta valve.
The Schrader valve is larger and shorter, allowing inflation without removing the top cap for easy operation, while the Presta valve is longer and smaller, requiring the top cap to be loosened before inflation.
For your reference, here are more details about the adapters:
1. The Schrader valve adapter is used for the tires on mountain bikes, e-bikes, motorcycles, electric scooters, and cars use a Schrader valve. To inflate the tires, please connect the Schrader valve to the Schrader valve adapter on the high-pressure air hose to begin inflating. To deflate the tires, please use an appropriate tool (for example, a 4mm hex key) to press the needle valve adapter to release the air;
2. The Fast-connecting air valve adapter can be connected to the Schrader valve for inflation. To inflate, please connect the fast-connecting air valve to the Schrader valve and press the handle down to lock it, and start inflating. To deflate, please connect the fast-connecting air valve adapter to the Schrader valve and press the fast-connecting air valve adapter down to release the air;
3. The Needle valve adapter is used to inflate balls like basketballs and footballs. To inflate balls, the included needle valve adapter is needed. To deflate, please screw the needle valve adapter onto the Schrader valve adapter, then insert the needle into the ball's valve to start deflating;
4. The Presta valve adapter is used to inflate road bikes and certain mountain bikes. To inflate, please connect the Presta valve adapter to the Schrader valve adapter on the high-pressure air hose, and unscrew the tire's Presta valve, then connect the Presta valve to the adapter to start inflating. To deflate, please unscrew the Presta valve's threaded cap and press the threaded cap down to release the air.