Special designation overcomes the weakness-- high pressure shut down. Because of the special designed rush-nob, it is very easy to install automatically on the machine line in factory or artificially in the field. Due to the self–owned filter on the dripper and the vibrate-clean principle of the PC dripper, it is more efficient on resisting clogging. Small size, less material, and lowest price in the same field. Laid on the ground or buried under the ground.