No air pollution, maintenance free Rocker series pumps are driven by piston, without the need of lubricant, regular oil changes and maintenance; with no oil pollution. ProteTM over flow protection Rocker series pumps are equipped with ProteTM over flow protection which can prevent a large amount of liquid from being sucked into the pump. Moisture trap with filter cartridge Rocker series pumps are equipped with filter cartridge in air inlet to filter particle and moisture to prolong the life of pump. Vacuum regulator Rocker series pumps are equipped with vacuum regulator to adjust vacuum. Thermal protection device Every motor of Rocker series pumps has a built-in thermal protection device to shut off the pump automatically when overheated and then resume working when the temperature cools down. CE certification CSA certification IP 30 protection RoHS certification