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NEW Nilfisk Hot Pressure WashersPressure WashersMachine Parts by BrandPumps & SparesPopular High Pressure HosesHose ReelsNozzlesPressure Washer TriggersUnloader ValvesInterpump Service KitsSpare O-rings for ST45 quick release pressure washer couplings, sold in packs of 100. The range includes O-rings for ST241 and ST45 couplings and large size O-rings for ST45 couplings in two versions. Check the coupling type and O-ring size before ordering.