The valve core that comes with these stems is very restrictive, barely lets any air in or out and once sealant has been installed, it becomes almost impossible to inflate or release any air, essentially rendering this stem useless. Thankfully I have spare cores on hand. Once I installed a new core, the stem worked fine. However, between the original cost of the stem, plus the added cost of a new core. these are no bargain. I would look elsewhere.
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