1, size: can be divided into 6-inch, 8-inch, 12-inch pump, you can choose the size of the pump according to the usual breathing habits.
2, classification: manual pump, foot pump, mini pump, automatic pump and electric pump.
According to the gas needle, it can be divided into two modes: no gas needle and self-contained gas needle. In comparison, the pump with its own air needle is more convenient than the pump without the air needle.
3, according to the classification of gas nozzles can be divided into: mouth, American mouth.
The American air nozzle is currently the most mainstream air nozzle and has the highest usage rate. The mouth of the mouth is mainly locked by the internal pressure. It is resistant to high pressure and the air leakage is steep. That is to say, when the air pressure is not enough, the gas leakage is faster, the gas nozzle base is large, and the diameter of the gas nozzle is also large, but the inflation flow is large, so it is widely used. It is applied to the inner tube with a large gas volume, which is convenient for pumping. The advantages of American air nozzles are mainly that the "compatibility" is better, and the use is more. There are also many American-style air nozzles on civilian vehicles, so replacement, repair and inflation can be found in many places; the disadvantage is that it is used in The knife ring is very inconvenient, because the mouth of the mouth is not long enough. When the air is blown, the mouth is always shrunk and it is not easy to be clamped. There is basically no problem in using the work circle.
The airtightness of the mouth is better than that of the mouth. The tighter the small ring on the upper side, the tighter the seal inside, the better the sealing of the natural nozzle, the tightness of the nozzle and the pressure inside the tire. Nothing, the disadvantage is that you have trouble pumping your feet. First loosen the small ring and then tighten it. The sealing of the mouth of the mouth is sealed by the small spring inside the core of the nozzle to seal the sealing core. The quality of the sealing has a great relationship with the quality of the spring and the sealing gasket. The advantage is that it is convenient to inhale.