Ultra-quiet: thanks to its reinforced shell and anti-vibration rubber feet that ensure a reduction in the level of noise emitted. High efficiency: it can produce the constant air flow of flow and powerful of 4 L/min for a consumption of only 1.7 W, it can provide more oxygen for your fish and promote its growth. Check valve: place a check valve return between the pump and the diffuser in order to prevent that in the event of a power cut, the water goes up through the pipe by siphon, damaging the motor and emptying the aquarium. Wide compatibility: suitable both for 10L to 100L freshwater and saltwater aquariums, breeding tanks, etc. Package Included: Air Pump, Air Hose, Bubble Stones, suction cup, check valve, user manual. x-3. Number of shipments: 1 pcs.