Blue Monster Compression Seal Tape stops problem leaks while under pressure - without turning off the water source! Developed for professional plumbing contractors, Blue Monster Compression Seal Tape is ideal for crisis and long-term applications. Blue Monster Compression Seal Tape features self-fusing layers that form a waterproof compression seal. Seal leaks up to 150 PSI on any type of rigid piping, from galvanized and cast iron to copper and all types of plastics and rubber. Blue Monster Compression Seal Tape contains no adhesive. This tape seals by compression, so pulling the tape as tight as possible forms a chemical reaction that fuses the layers of tape into a mass of silicone. Once fused, the silicone mass forms a heavy-duty bond on the leak or connection that serves as an emergency or long-term repair.