... by on-site maintenance easy, good sealing performance.JS-01 type Swivels are widely used in water, ... , drilling can meet the needs of 300 meters.JS-02 connector type water volume is small, reasonable ... the needs of 300-1500 meters drilling.JS-03-type water with JS-02 type connector advantage through high water ... -2200 meters of coal drilling and drilling needs.JS-04 type of water connection for more than ...