Description: Aquarium Fish Tank Throttle Water Flow Control Switch 12/16mm 16/22mm Can control the water flow effectively High quality plastic, wear resistant and durable Work with external filter, easy and convenient, can avoid the problem of water draining   Specification: Material: Plastic S Size: 100mm long, 12mm outlet diamter, 9mm inner diamter L Size: 135mm Long, 16mm outlet diamter,13mm inner diamter   S size suitable for 12/16mm Hose (3 way pipe, 12mm inner diameter, 16mm outside diameter hose). L size suitable for 16/22mm Hose (4 way pipe, 16mm inner diameter, 22mm outside diameter hose).   Package Includes: 1 x Aquarium Water Flow Control Switch  

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