Pure Silicone Rubber Sealing Tape that fuses to itself to make a permanent or temporary seal. It stretches to at least twice its original length, and forms a tight, chemically neutral seal. 3-4 inches is plenty to seal a joint in 2" (50 mm) tubing, and the seal will last for years. It can easily be removed by cutting or tearing if equipment needs to be disassembled.
Also makes an excellent electrical tape for wrapping wires, splices, etc.
12 foot roll, 1" wide, transparent.