All In One Package - No Worry about Mismatching - Complete standard set of aquarium accessories for most air pump brands. 13 ft. Airline Tubing - 3/16 inch Standard ID Clear and Flexible material. Desired length for most fish tank, Toxic-Free, White, Flexible, and Kink-Resistant. 2 Air Stone Cylinder - 1.2 inch Airstone can be easily driven by even Nano air pumps. Suitable for aquarium, and fish tank. Measure 0.8 x 1.2 inch (D x H). 6 Suction Cups and 2 Check Valves - Excellent 3/16 inch ID Standard airline tube holder, stick tightly to the smooth fish tank. Red clear valve can prevent water from back siphoning. 4 Connectors (Straight & T-shape) - Perfectly connect standard tubing, T-connector allows you to combine two inputs to create one output with dual outlet pumps. Must-have Fish Tank Accessories Complete standard set of aquarium accessories for most air pump brands, Includes 13 ft. airline tubing, air stone, check valve, T and Straight connectors and suction cup, 13 Feet Airline Tubing 3/16 inch standard inner diameter. Flexible, frosty clear, kink-resistant and durable. Toxic free which is safe for your fish. 2 Air Stone Cylinder 1.2 Inch air bubbler can be easily driven by even small air pumps. Suitable for aquarium, and fish tank. 6 Soft Suction Cups 3/16 inch ID Standard plastic clear airline tube holders stick tightly to the smooth fish tank. Easy to install and uninstall. 2 Non-Return Check Valve The air check valves are made of durable clear plastic and protect your air pump by preventing aquarium water from back siphoning during a power outage. 2 Set of Straight & T Connector Perfectly connect standard tubing, T connectors allow you to split one input to 2 outputs for the second air stone or filter.