Pack of 16 non return check valve, 2 colors ( each color 8pcs).
Small and compact, which protect you air pump by preventing aquarium water from back siphoning during a power outage.
Detachable design makes it easier for you to unscrew, clean and repair.
Air Hole Diameter: approx. 5mm/ 0.19", Overall Size: 5 x 1.5cm/ 1.9" x 0.6"(L* D)
Great accessories for universal air pump, fish tank, aquarium.