The filter we called water absorb and purify air filter, It can effectively absorb the moisture which is produced from the air compressor when the air is in compression process. Moreover, it can purify the air and make our air bottle or other tanks get more effective protection.The filter can eliminate the oil-water and impurity into the air bottle. And the golden color body can be used permanently, what we to do is only change the fillers. The filter’s size is thickened and lengthened. So it is really obvious to absorb the oil-water and air purifying,without any oil-water and impurity into the air bottle. It can suit for both single cylinder and double cylinder air compressor.