Made of FDA approved drinking water safe silicone, it works in temperatures of -65 below to 400 degrees above zero and your garden hose would fail long before the Seal Genie™ to expand into the threads of a connection, with multiple mini compartments forming tight seals against the threads. The compressibility of the silicone is superior to EPDM, natural rubber, vinyl and many, many other materials.
Will not dry out, crack, split or rot.