1 Piece Aquarium Check Valve For Air Pumps Silicone Hose

The check valves are for common aquarium air pumps. These check valves help to protect your air pump by preventing aquarium water from back siphoning during a power outage. The check valves are made of durable clear plastic and have a net weight of 0.14 oz / 4 g. Please use a paperclip to poke it from the input side to the Output side when the outlet inside gets stuck.     Features:   > The check valves are for common aquarium air pumps. Please DO NOT use them with the CO2 system. Great one-way check valve for aquarium and fish tank. > Protect your air pump by preventing aquarium water from back siphoning during a power outage. > Made of durable clear plastic. Net weight: 0.14 oz / 4 g. Please use a paperclip to poke it from the input side to the Output side when the outlet inside gets stuck. > Air Hole Diameter: 0.15"" / 4mm; Overall Size: 2.1"" x 0.58"" / 5.3 x 1.5 cm (L*Max.D)