Clamseal can instantly repair splits and tears up to90mm (31/2) in length without the use of any hand tools, or adhesive, repairs small tears or splits in inflatables above or below the waterline. How to use- Open and insert the base plate in the split- Pull the plates together using the lanyard- With the 2 plates pulled together, simplyhand-tighten the nut for a Clamtight seal..