Stop & Go Pocket Tire Plugger Tool Kit for tubeless tires. This new kit and tool easily installs mushroom shaped rubber plugs (related items) into all tubeless tires while staying on the wheel. The Plugging device "drives" the plug into the hole by turning the hex wrench. The plug expands under pressure to fill the punctured area. A firm pull on the stem with the pliers seats the mushroom head on the inner wall allowing no air to escape.