There is nothing more frustrating than getting a puncture at the side of the road then having your pump release all the air (and the valve core)
Pro-tip: press the little black button on the hose to release the pressure between the core and the hose. Hey-presto: no more unwanted valve-core extraction.
Pro-tip: press the little black button on the hose to release the pressure between the core and the hose. Hey-presto: no more unwanted valve-core extraction.