20/30/45/60/75cm Air Stone Bubble Bar Wall Curtain Tube Hose For Aquariums Fish Tanks The AIR CURTAIN HOSES is a porous rubber hose with good softness, and any shapes required can be realized. It's bubble disperse evenly and oxygen supply is excellent. Excellent for decoration and supply in all kins of aquarium Suitable for Aquariums and Fish Tanks Ideal for fresh / tropical and salt water aquariums as well as reptile habitats. Color: Black Length: 20cm/7.87"(single head);30cm /11.81" (single head); 45cm / 17.72"(single head); 60cm / 23.62"(single head) ;75cm/29.53"(Double head) Connector Size:0.35x 0.27cm/ 0.14" x 0.11"(Outer Dia*Inner Dia) Tube Size:12x 10cm/ 4.72" x 3.94"(Outer Dia*Inner Dia) Quantity:1Pc Tips and steps: 1. Firstly connect rubber hose to the check valve outlet with 0.35mm air tube, then connect it to the air pump with 0.35mm air tube and steep it into the water. Once power on, equal bubble can be dispersed immediately. 2. After being used for a long time, the holes on the surface might be locked. Immerse it in hot water water for about 8 minutes, then use brush or cloth to rub the surface slightly. Double head meaning both ends is air holes, need double oxygen pump, A single head means at one end is air holes, the other end is sealed. NOTE: The Bubble Tube In addition to 75cm double-headed, others are single head Maybe you need Piercing hole with needle in the tube by yourself Package includes: 1Pc x Bubble Tube