Ideal for aquariums that house turtles, reptiles or amphibians. Simply squeeze a couple of times to start syphoning action. Dual adapters fit most hoses (13/32″ – 12 mm and 9/16″ – 14 mm The MARINA siphon starter easily attaches to any siphon or gravel cleaner 10 or 14mm in diameter. Simple hand pressure starts water flow without mess or bother. Constriction of bulb also controls water flow.