O-rings can become brittle over time, which leads to failure. If youve used your fittings for over a year, and you want to use them in a new build, Its good practice to replace them, making sure they dont leak on your shiny new components. This set of 50, will keep you going for a long time! Compatibility: Any G1/4" fitting made by XSPC or any other brand Contents: 50x XSPC G1/4" NBR O-Rings - Black Model: 5060596651524