Estone 1/4" Float Valve For Aquarium Level Control Fish Tanks Food Machinery Drinker This float valve, has a 1/4" quick connect fitting and adjustable water level. It works great for the Stealth-RO and Small Boy or any other filter system with 1/4" tubing. Auto Fill Valve is perfect for both permanent and temporary installations. Non-toxic, tasteless, and can be used for drinking water or food machinery. Valve Body: ABS Plastic.