Aquarium Air Pump Accessories for Standard Air Tubes Made of soft plastic, the air hose is durable enough to withstand wear and tear. Fits All Standard Outlets: Standard size (4mm ID), fits most aquarium air pumps and standard air stones. Transparent, very light and soft, easy to hide and mix, perfect for any aquarium and disappears in water. Safe and non-toxic, will not harm your fish. Scope of delivery: 1 oxygen tube, white, 5 m long, inner diameter 4 mm
