Features: Plastic aquarium valves Made of durable clear plastic, small and compact size, excellent water resistance Air hole diameter is 3mm , compatible with standard aquarium air hose of about 4mm inner diameter, is easy to install. Functions: The valves suitable for aquarium or fish tank, one measure Safety guard to protect your air pump by preventing aquarium water back siphoning during a power outage. Specifications: Material: Plastic Color: Black, Clear Air Hole Diameter: 3 mm/0.12 inch Overall Size: 42 x 13 mm/1.65 inch x 0.51 inch (Length x Max Diameter) Listing Packing: 12 * transparent plastic valves
