Review on Trident Deluxe Scuba Diving O-Ring Kit: Save-A-Dive for Tank Valves, Hoses, Regulators, Cameras, and more by Kevin Mariappan

The description says 40 o-rings and I was a little disappointed that a dozen of them are so tiny I've never seen one used in Suva of this size and there were 4 huge ones sizes, they were only for the tank valve. No diver will ever use anywhere near half of that. Every year your tank is visually inspected and gets new valve O-rings. I've been diving since '96 and have never used a cylinder valve o-ring. I was expecting 40 o-rings to be used on hoses, tanks and regulators.