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NEW Nilfisk Hot Pressure WashersPressure WashersMachine Parts by BrandPumps & SparesPopular High Pressure HosesHose ReelsNozzlesPressure Washer TriggersUnloader ValvesInterpump Service KitsLow pressure water valves for pressure washer water supplies. The range includes brass non-return valves from 1/4 to 1 1/4 inch, including York 3/4 and 1 inch valves, backflow preventers, a 1/2 inch flow restrictor body, brass 1/4 inch female metering valves and ST66 chemical metering valves. Check threads with our BSP thread size chart.