Pack of 30 check valves for air pumps, 4 mm diameter, 43 x 13 mm, for aquariums, black

Product Size: The product measures 43 mm long, 13 mm wide, and 4 mm in diameter. Measurements are taken by hand, so the dimensions may vary slightly. Compatibility: The product is suitable for most aquariums and fish tanks. Product Function: It can prevent the aquarium from drawing water when the power is off, thus preventing the water pump from priming. (If the internal connector is blocked, use a paperclip to tighten it from the inlet side to the outlet side.) Product Material: The product is specially designed and made of plastic material, ensuring a long lifespan and resistance to damage. Easy to Install: It can be directly replaced without adjustment, offering perfect compatibility and high reliability.