Universal poppets are a great solution to your poppet problems! They are made to fit most every standard manufacture and model of Cornelius keg. Instead of having to worry about getting the speficic poppet for your keg, you can keep a few of these on hand and change out your poppets whenever you need! These come with a spring, a poppet head, and a smal o-ring that fits on the head. With these, you wil be good to go, even if your kegs are all manufactured by different companies!