Review on AKOAK Standard Diameter Aquarium Valve（Grey） by Justin Metz

DON'T SPEND TIME ON IT! I took 20 packs of this company's air valves and over half of them arrived defective with extra plastic attached to the top of the handle when the caps were removed. This caused the pen caps to crack and break, rendering them completely unusable. Save your time and choose the Asamuyu brand, which is also sold on Amazon. They give you 30 packs instead of 20 for about the same price and a MUCH BETTER quality. None of the air valves came with the extra plastic that ruined these. This company should really test the quality of their valves before shipping more. I don't want more people like me to be scammed.