OEM replacement valve assembly for the SHURflo® PowerTwin 12-volt diaphragm pump (model 4111-035). Worn valves cause reduced flow, lost pressure, and pump inefficiency. Replacing the valve assembly restores the pump's full 7 GPM output and 45 PSI shutoff performance. Fits PowerTwin models only — not compatible with standard 2088 Series pumps. Designed for field maintenance without special tools.