AREA Couplings for RGS conduits received UL approval Published：2009/4/14 上午 10:23:00     Number of visitors：640   AREA is excited to have the following RGS conduit couplings approved by UL 6 standard: 3", 3 1/2", 4", 5", 6".    At AREA, we also have smaller sizes approved by UL 6 standard: 3/4", 1", 1 1/2", 2", 2 1/2"