12" Fixed Mechanical Seal Sleeve Flanged on Both Sides. Pipe-Seal-Fix is a continuous mechanical spanning system for the partial repair of damaged points within sanitary and industrial sewer lines, as well as drinking water systems. The basic principle of the Pipe-Seal® system is to provide a permanent internal seal within an existing pipe system at points where leakage, root intrusion and structural intermarry is in question. Pipe-Seal-Fix is a rolled stainless steel sleeve, containing an elastomer seal, that can be spanned over a damaged spot. The sleeve is manufactured in a way that the seal will permanently interlock within the defected pipe wall.