Contributed to make homemade 4 wheel (with spare) up/down air hose! They slide open very easily and when it's time to remove them, they can be removed with one quick and powerful pull! This is a closed valve, meaning if they are not connected to the tire valve they will not release air! They only let air through when they are attached to the tire valve! My homemade 4 wheel (5 with spare) up/down tire inflator is easy to use!