Review on JACO Lightning Presta Schrader Valves by Gerald Reeves

I use it on two different compressors. They're much easier to swap between Presta and Schrader valves than most hand pumps you buy. They are also very easy to apply and remove with little or no air loss. I have tried many different types of ammo for my bike as it is very difficult to get at and hold the ammo. This made it very easy and also made it easy to inflate my bike's tires with Presta valves. Update 11/18/21 - I have replaced these two cartridges with others. The idea is great, but the execution is not that good. Getting and removing valve stems is a hassle. They work great the first few times, but then the tops loosen and spin. You need to make sure the dot is on P or S every time you use it as it will move on its own. I really wanted to like them, but I'd rather use an adapter than deal with this ammo every day. Save money and get a better cartridge or one of their standard cartridges. JACO usually makes good products, but this is not one of them.