Simply peel and stick to make a fast and easy repair, or stick it on any new bladder. Specially formulated adhesive is incredibly durable and will stick on any bladder material or color. Everything needed to make a fast and permanent repair is included in package. Alcohol wipe, and detailed instructions printed on package. The 9mm Self-Stick-Valve is the industry standard for all inflation valves. Will work on 99.9% of all kites in production. One way valve lets air enter while pumping but stops air from going out. Simply squeeze valve to let air out. 1-way flap can be cut out to create a 2 way valve.