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McDonnell & Miller 61 HD Low Water Cut Off R 410A High Sensitivity: The rubber seat High Sensitivity: The rubber seat poppet ensures positive shut off and maintains stable delivery pressures despite fluctuations in supply providing additional reach compared to the industry standard 20 foot limit The 61 HD is rated specifically for low pressure steam systems with a maximum operating pressure of 20 PSI (1 The McDonnell & Miller 61 HD (Part Number 140300) is a heavy duty mechanical low water cut off designed specifically for low pressure steam boiler applications
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