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NEW Nilfisk Hot Pressure WashersPressure WashersMachine Parts by BrandPumps & SparesPopular High Pressure HosesHose ReelsNozzlesPressure Washer TriggersUnloader ValvesInterpump Service KitsMetering and chemical valves for adjusting the amount of chemical drawn into a pressure washer or cleaning system. The range includes ST66 metering valves, including a red top version with a numbered disc and dual chemical pickup, brass 1/4 inch female metering valves rated at up to 250 bar, PA chemical metering and control valves, an ST61AS stainless steel chemical restrictor and an ST161 metering valve repair kit.