These screw valves allow you to remove them when you need to add tubeless sealant and they can be replaced with Presta cores in seconds. By far the best solution against annoying prestas! Most mountain bikers and cyclists have been somehow brainwashed into thinking and defending inferior, unreliable, weak Prestas. These valves prove how wrong they are. I recently ruptured a pump while riding and it was easy to use a cheap pump without messing around with valves like a Presta. Countless times I've lost cores or damaged Presta valves after trying to get home and inflate tires. It's so easy to break something fragile, but with these valves I don't have to worry or fiddle with perfect alignment or matching between it and any pump I might have on hand. Love these valves, will be getting more for any future bikes I might have and as gifts for friends.
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