Are you looking for some professional, yet fish tank oxygen pump air regulating valves? Are you in search of some sturdy, trustworthy tools that can do multiple jobs at once? , ! Our product must meet your needs. It is one of the for you. Features - Color: White and Yellow. - Material: Plastic. - Size: About 5.00X2.00X2.00cm/1.97X0.79X0.79inch. - Note: This product includes 10pcs white and 10pcs yellow. - Note: Suitable for oxygen tubes with an inner diameter of 4mm. - A good substitute for broken and old oxygen pump air regulating valve. - Easy to install and use, stable and firm, not easy to fall off. - Its practical and professional design is easy to control . - Suitable for fish tank and aquarium oxygen aeration pump. - This is fit for connecting 4mm inner diameter . Package list: 20 x oxygen pump air regulating valves