The tires were obviously old and/or defective. Will not seal when installed by a professional. I had to insert tubes into the tires. Old tires are sealed without any problems; So it is doubtful that the problem was with the hard drives. Too many problems to take the tires out of the wash and send them back to the dealer. They need a tractor, so you'll have to settle for using them with cameras. But now their punctures cannot be plugged. Will not use this seller again.