Ultum Nature Systems DELTA Quick Release Double Tap Valves for aquarium canister filters are easy-to-install inline valves with compression fittings for fast and secure installation. Once installed, this upgrade to your aquarium filter allows refined flow adjustments or powerhead pumps. The quick-release allows for convenient disconnection with minimal to no spillage. Engineered and designed from durable and lightweight ABS plastic, this valve connect is resistant to accidental impact, acidic and alkaline water. Available in two common sizes and does not require tools for installation. Available for hose size (hose diameter: Inner 12mm / Outer 16mm) or (Inner 16mm / Outer 22mm). Quick & easy installation. Allow for canister filter and/or filter tubing and glassware to be cleaned thoroughly and easily. Constructed from high-quality material for extra durability. Suitable for alkaline or acidic aquarium parameters. Suitable for freshwater and saltwater aquarium use. Adjustable water flow and speed to and from the canister filter. Suitable for hose size (hose diameter: Inner 12mm / Outer 16mm) or (Inner 16mm / Outer 22mm).