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The 22261 is a maintenance kit for the CS511 (Sensorex DO6400). Two maintenance kits are offered for the CS511. They contain the same components but with different quantities. The 22261 includes five PTFE membranes, five membrane O-rings, five tensioning washers, and a 250 ml bottle of electrolyte. The kit is Sensorex part number DO6050-T. The 22262 includes 25 PTFE membranes, 25 membrane O-rings, 25 tensioning washers, and a 500 ml bottle of electrolyte. It is Sensorex part DO6051-T.