This semi-automatic vertical double head liquid filler equipment is full pneumatic type, do not need electricity. You need to have the air compressor for it. The full air bottling machine is mainly used for large volume filling like water, oil, milk, gel. There's a switch for auto and manual function, you can set the interval time to let it fill continuously or use the pedal to control each filling time. Filling volume ranges range 500ml to 5000ml.