Car tire valve for tubeless tires, which in an emergency (torn, porous, leaky rubber valve) can be inserted into the rim from the outside, is attached by hand and seals from the inside when screwed tight thanks to the conical shape and rubber ring. This saves you having to change to the spare wheel and you'll be ready to drive again after just a few minutes (compressor required!).
If a Colby is not left installed for weeks, it can be used again without any problems.
Great idea! Valve damage doesn't happen as often off-road as tire damage, but when it does happen, I don't want to be without the Colbys!
I recommend the Emergency variant for quads, ATVs and all cars that do not have tools on board.
You can see how it works here in a video from Colby Valve or in a video from 4x4passion in which I show the installation of a Colby Valve Ultimate. Works with the Emergency according to the same principle, only manually.