Most of the time, rubber grommets are hollow in the middle, so you can safely and easily run cabling, wiring or tubing through them. However, they don’t necessarily have to be. Sometimes, a rubber grommet can be closed and act as a seal, and sometimes, you can have the best of both worlds in a single product. A rubber cable grommet seal, for instance, is a kind of grommet that allows you to run cabling through it, but it also offers a better seal and protection compared to the regular, open-type rubber grommet. These types of grommets usually come with a thin, easily cut sheet of rubber in the middle, so your cables or wires can still be pushed through it, but the rubber still stays in place, offering much better protection from dust or other particles that could interfere or cause problems with your electrical device.

Additionally, you could also find a rubber cable grommet seal that is particularly made for the use of sealing the edges around the point of entry. For instance, a grommet would seal the area where the device ends and the cable begins. You would often see this in electrically-powered devices. Also, rubber is naturally non-conductive, which makes it a great fit for electrical devices as it offers excellent insulation and protection, among various other things like dust-proofing, vibration dampening, temperature resistance and so on. A lot of it also depends on the material from which the grommet is made of, as some rubbers are better for this kind of use than the others.

Arguably the best thing about these rubber grommets is that they can be made in a wide variety of ways to accommodate your needs, which is precisely why these are some of the most commonly used rubber grommets across various industries.