... : 1. with streamline design, it is beautiful and decent. made from abs plastic, the shell of ... endures to shock. and the air-intake room is made from macromolecule complex rubber, and has long ... silicon. with the adjustable exhaust, this device is advanced, reasonable, high-efficiency and energy-saving. ... non-oil pump, and the exhaust air is clean. it is suitable for adding oxygen into various aquariums ...