Review on Revolutionary Colby Valve Permanent Stem Replacement - Effortless Installation from Outside the Wheel! by Mark Gancio

They are very well made and very easy to assemble. The good thing is that you don't have to remove the tire from the rim to mount it. One thing to note when installing. They should be fairly snug, but don't overtighten as this could damage the rubber bushing. You can actually turn the nut by hand with the valve stem in hand before installation to see the brass piece expand the bushing to seal it in the wheel (just as a test). Remember to loosen again before installing. Don't tighten it with a 1/2 inch socket which is recommended to be tightened like you would normally tighten a nut on a bolt. This would destroy the socket and cause it not to be tight. Home for mowers, 4 wheels etc. d.