Thru Dex – NewMar type fitting

I am looking for something like New Mar’s Thru Dex fitting (like their dx-2 model) for covering a hole for electronics cables.

See:
http://www.newmarpower.com/Antenna_Cable_Accessories/Antenna-Cable_Accessories2.html

I attempted to add a picture.

It does not have to be this exact product, but it would be nice if I could order it (or pick it up in the South Metro) and get it in a few days.

Thanks.