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 for Ideal for fresh / tropical and salt water aquariums as well as reptile habitats. Color: Black Length: 20cm/7.87"(single for head);30cm /11.for 81" (single for head); 45cm / 17.72"(single for head); 60cm / 23.62"(single for head) ;75cm/29.53"(Double for 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 for 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 for 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 for head meaning both ends is air holes, need double oxygen pump, A single for 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