Review on 6PCS Presta to Schrader Valve Adaptors for Bike, Convert Presta Valve, Inflate Tire with Standard Pump or Air Compressor, Includes 12PCS Tire Valve Caps by Michael Cormier

Threading is correct - it fits easily into the Presta hose valve and both my hand pump and air compressor blower fit snugly. BUT both pumps have a center pin that needs to be pushed in to allow air to flow. When I put the inflator directly onto the presta valve, its diameter is small enough to push on the pin (but doesn't seem to be pushing air into the hose). With one of these adapters in place, the Presta valve will not extend far enough to engage the pump pins. If there was a way to change the design to bolt them on further, the principle should work if the Presta valve were lengthened to an adjusted range. . BUT NO. UPDATE 7/28/2020: The seller saw this review and refunded the purchase without request which was very nice. They also said they would ship a set of "expanded inflation valve stems." I don't know what they are but when they arrive and I can figure out how to attach them I'll update here.