2 PCS Locking Air Chuck with Air Hose & Standard Tire Valve Fine Thread - Heavy Duty Air Inflator Hose Adapter for Twist to Lock On Connection - Perfect for Car Tires, Bikes, ATVs and Inflatable Toys

My Ryobi battery powered inflators each started leaking air around the hose at the chuck end, so I ordered a Shraeder barb end adapter here on Amazon to let me use these locking air hose chucks on the two Ryobis.Installing the shraeder barb end adapters in the Ryobi hoses was not a problem, and these hose chucks screwed on without any problem. I was impressed with the construction on these: The Ryobi chucks consist of thin plastic levers secured in a stamped and crimped sheet metal shell, with a plastic barb attaching the chuck to the hose, all held in place by a small screw in the thin sheet metal - flimsy at best, with a lot of rattle and slop in the chuck mechanism .These adapters use a metal barb and sturdy metal lever, and the shell is metal about 3x greater wall thickness than the Ryobi part, A shouldered pin inserts through the lever and can only be removed by compressing the lever down into the shell with a LOT of effort.Which is where the question comes in. The Ryobi uses a black rubber part for sealing the chuck around the tire valve. This part abrades on the valve thread, and eventually the part (or entire chuck) needs replacement.The 'rubber' part on these chucks is grey, and looks more like silicon than rubber. And while it makes an adequate seal around the stem, it seems to leak a small amount of air when attached to the tire stem.This leakage is a slight hissing sound, and probably not a problem for car and truck tires, etc. But I use my Ryobis for topping up the latex tubes on my TRI bike just before the start, and small hiss sound coming from a high pressure small volume tube means an unacceptable loss of pressure. The old Ryobi chuck - cheaply made -did not have any hiss and removed with a sharp popping sound. This chuck is less secure. I had always been able to avoid buying a $50+ pro presta valve chuck to inflate my tires, but may need to bite the bullet if I can't get these working better. I will try taking the chuck apart and seeing if the black rubber seal from the Ryobi will work in the new chuck, but question why the grey component in this chuck leaks air, when the really cheap chuck on the ryobi didn't leak. And if it has a small leak now, what will it be like after a few months of use every other day?Again, this is very well made and heavy duty for most purposes - including most bike tire use. But for my fringe use of latex tubes and racing tires, this doesn't work as well as the cheap Ryobi chuck - go figure!!!So these are well made chucks and probably perfect for most uses, but not for my application.EDIT: There were two of these extensions in the package, and I found that the second one didn't leak at all. So I played around with the leaky one, taking the chuck apart and removing the silicon/rubber seal that goes around the valve stem. I saw a small irregularity on the surface, a bit of rubber protruding out. removing this irregularity fixed the problem, and they both work perfectly for me.Edit 11/2023: OK, so the second hose is now as bad as the first hose was out of the box, leaving me with 2 hoses/chucks that are barely usable. The fault lies with the gray rubber material in the chuck. Even when pushed as far down on the valve stem as possible, both of them hiss even before the compressor is turned on! Why all the fuss about such an inexpensive part? Just buy a new pair? My problem is that 99% of the cost and parts on these is well made, and only a simple silicon/rubber donut is inferior. And it is not user replaceable. So the well made parts, which took a lot of energy to manufacture (green house gas, and China uses mostly coal burning power plants!) now go to a land fill as waste because of a cheap part which isn't user replaceable. And if the 2 of them only lasted 2 years, that means every year a hose goes to the landfill, and a new hose must be purchased. Wasteful, at best.