
I use them to inflate the EUC tire. The valve stem is in a narrow spot and at an acute angle. I always had to inflate too much air to make up for the air loss I lost when the air hose was disconnected from the valve stem. When I inflate a tire these things make it easy to detach the air hose from the valve stem without losing air. It is screwed, screwed, without losing the slightest draft.

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