6"-8" Mechanical Seal Packer. PipePatch Mechanical Seal’s sealing technology is a continuous mounting stainless steel system designed for non-accessible piping systems. It features a unique locking system that ensures the sleeve never slips or breaks the seal. PipePatch Mechanical Seal is proven compatible for potable water, process water, wastewater, salt water, fuel and gas lines. Made of long-lasting, corrosion resistant stainless steel with a rubber compression sealing.PipePatch Mechanical Seal is durable and approved for a variety of pipe materials. PipePatch Mechanical Seal effectively repairs longitudinal cracks, transverse cracks, radial cracks, broken fragments, root penetration and socket end leaks. With PipePatch Mechanical Seal, municipal piping problems can be easily solved with a simple, long-term solution.