The inner wall of the Perma-Seal™ sleeve is lined with a special hot-melt adhesive. As the sleeve is heated, the adhesive melts and fills any existing gaps to create a seal. The product repels moisture even during pressure cycling, resists abrasion, and stands up to some of the most rigorous tests that can be applied to high performance splices. Perma-Seal™ is used where reliability and strength are a priority.