| CPC D06F 39/022 (2013.01) [A47L 15/4418 (2013.01); A47L 15/4463 (2013.01); A47L 15/46 (2013.01); F04B 41/06 (2013.01); F04B 53/10 (2013.01); A47L 2501/07 (2013.01); A47L 2501/26 (2013.01); D06F 2105/42 (2020.02); D06F 2105/60 (2020.02)] | 20 Claims |

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1. A chemical dispenser, comprising:
a housing;
a controller disposed in the housing for operating the chemical dispenser;
at least one module bay in the housing; and
at least one module selectively coupled to the at least one module bay and operatively coupled to the controller for operation with the chemical dispenser,
wherein the at least one module is selected from a plurality of modules each capable of being coupled to the at least one module bay and operating under the control of the controller; and
wherein the at least one module comprises a face plate configured to engage with a support surface of the at least one module bay to secure the at least one module to the housing.
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