REMA TIP TOP's 571 REMA SEAL refill pack for commercial truck tire repairs replaces traditional string tire plug kit refills. This pack of 20 vulcanizing commercial truck tire repair units use a multi-layer construction with special texture to seal tire injuries. Efficient sealing of the injury to prevent air loss and penetration of moisture, dirt, and other contaminants. Quick vulcanizing of the bonding layer via heat generated by the tire during driving helps this innovative tire repair unit far exceed the performance of standard tire repair kits for added safety. Simply clean the injury channel with a hand rasp or carbide cutter. Coat the injury channel with Special Blue Cement using the rasp, awl, or the insertion tool. Insert the REMA SEAL repair unit into the eye of the insertion tool. Apply a coat of Special Blue Cement to the REMA SEAL repair unit. Without turning the tool, insert the REMA SEAL repair unit into the injury, up to the base of the insertion tool. Pull the insertion tool straight out, leaving the repair unit in the tire. Inflate the tire to proper operating pressure. Cut excess REMA SEAL repair unit from the outside of the tire with a knife or cutters. Check the tire for leaks. Proceed to a qualified tire repair facility and have the tire properly repaired from the inside. Proceed to a qualified tire repair facility and have the tire properly repaired from the inside.