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The AutoFlo 500023 is the correct replacement for the following models of whole house humidifiers:
The AutoFlo Rubber Overflow Tube for Model 800BP contains a molded rubber tube that fits in the bottom of the humidifier for connection to the drain hose. This AutoFlo humidifier part also includes the overflow plug that fits into the rubber overflow tube.
AutoFlo Rubber Overflow Tube for Model 800BP specifications: