Features & details Electromagnetic air pump: superior ZL 102 Aluminum alloy, outstanding heat dissipation performance, surface phosphating treatment, electrostatic spraying, uniform color. No lubricant design, compressed air is purer. Max air pressure & air volume: The powerful 18W electromagnetic motor produces remarkable air pressure (over 0. 02 mpa) and delivers a large amount of air to the six adjustable valve outlets. 100% copper outlet nozzle for long-lasting stable oxygen supply. With standard air tubing: 1/4" Diameter, 25 foot Tubing, flexible and sturdy, won't become brittle or crack. Transparent and non-toxic, so it won't hurt your fish. Ideal for use with aquarium decorations or bubblers and multiple filters. Wear-resistant and shockproof: The steel engine Cylinder Piston adopts latest wear-resistant material, which is highly wear-resistant and completely energy-saving, economical. Rubber anti-vib