The R-BOX accommodates transmitters, meters, indicators, analyzers, integrators, and many other rail-mounted instruments. The variety of available R-BOX sizes means that we have an R-BOX that will ﬁ t your process needs. Choose from standard internal widths of 3, 6, 9, and 12 inches. Designed to meet Type 4X and IP66 ratings, the R-BOX is resistant to ultraviolet rays and chemicals. Its high-impact structure protects instruments even in harsh ﬁ eld conditions.