A watertight cable entry needs a continuous, effective seal at the panel and around the cable. Leaving an open gap beside a wire cannot be assumed to prevent water entry.
Match the cable range
Use a grommet intended for sealing and follow its specified cable-diameter and panel-thickness ranges. Cable shape, surface condition and installation affect the interface. Multiple wires may require a profile designed to seal each passage.
Confirm the environment
Specify the required water-exposure test and verify performance in the intended assembly. The grommet protects the entry point; it does not make the rest of the cable or enclosure waterproof.
Rubber and silicone compounds have different chemical limits. Confirm compatibility with actual oils, cleaners or other fluids at the intended concentration, temperature and exposure duration. Do not rely on a claim of resistance to every chemical.
