Each grommet is designed to accommodate several cable diameters. There are a number of separated thin layers of material working towards the core of the grommet. The installer simply determines how many layers of material to ‘peel’ away from the core that will give the cable diameter its best fit for a ‘seal’. This is determined via use of a diameter-tape measuring tool.

By wrapping the tape around the cable, the installers will be able to view markings that will direct them towards peeling away the proper number of layers from the grommet. The grommet is then placed around the cable, installed in it’s seat, and once the bolts are tightened via the pillow blocks, the cable is pressure-proof sealed.  For those who use a common fiber cable size you will not have to re-measure the cable using the gauge every time. Simply remember how many layers you need to peel away.