ASCO Numatics R501AY428501001 Pneumatic Valve Manifold

R501AY428501001 is a double sandwich shut-off block for ASCO Numatics 501-series pneumatic valve islands, designed to shut off pressure between stations when mounted in a manifold. It is described as a sandwich shut-off block for 501-series valves and is compatible with 11 mm wide 501-series valves, with applicability to 501, 502, and 503-series valve islands. The kit includes a sandwich plate, sealing kit, and mounting screws, and the 4-station configuration is captured by the part number (D=4). This isolation block is used to shut off supply to selected sections of a valve island, enabling maintenance or servicing of individual valves without dismantling the entire manifold. In catalogs, it is listed as a sandwich shut-off block for the 501-502-503 Series family, aligning with ASCO Numatics’ modular valve island offerings.