Aquarium Fish Oxygen Air Line Tubing Flow Control Valve 20 Pcs Gray

30 pcs Aquarium supplies:20 x Aquarium Air Valves & 10 x aquarium bubbles air stoneProduct DescriptionCreates bubbles in fish tank while attached to an air pump.Used to increase the dissolved O2 level in the aquarium.It is an important instrument to successfully keep aquatic fish for respiration process.The air valves are for fish tank aquarium use.Help to increase oxygen and keep air fresh, create healthy environment for your fish.Easy to connect hose.Material: mineral, plasticimport diameter : 4.8mm/ 0.19inch + 5mm / 0.2inchSize(approx) : 3.9 x 1.3cm / 1.5inch x 0.49inch(l*w) + 47 x 23mm / 1.9inch x 0.9inch(L*W)color: blue + GrayWeight: 44g + 39gProduct Name: Aquarium Air ValvePackage Contents : 20 x Aquarium Air Valves10 x aquarium bubbles air stoneOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.