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The John Guest NC2811 is an elbow check valve for the outlet of reverse osmosis membranes to prevent soft water from flowing backwards. Acetal construction allows fluid to glide through it with ease due to is low surface friction. Handles a maximum pressure of 150 PSI at 68 degrees Fahrenheit. Its cracking pressure is set to activate at 0.3 PSI. Designed with a 1/4" tube connection and a 1/8" NPT connection.
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