Ross Controls 500B91 Base Assembly is a single ANSI size 1 sub-base designed for base-mounted Ross valves, providing a 1/4-inch outlet port and a stable platform to mount valve bodies in Ross base-mounted configurations. This base assembly supports indicator lights in the base, enabling status indication directly on the manifold as part of Ross’s base-mounted valve options. The 500B91 model appears in Ross catalogs as an ANSI size 1 base/sub-base with a 1/4-inch outlet port, confirming its role within the family of Ross base assemblies.
