uxcell Plastic Aquarium Fish Tank Straight Air Tube Joints Connector 600pcs Clear White They are made of good quality white plastic, non-toxic and durable Total Size: 27 x 8mm/1.1" x 0.31"(L*Max.D) It is suitable for connecting standard aquarium tubing, mending or extending air hose Durable plastic construction, fit for connecting most of fish tank air pump. Connecting Dia: 5mm/0.2"