Which component may need to be disassembled and cleaned during the maintenance of a draft beer system?

Beer foam on beer (FOB) devices, also known as foam control devices, play a crucial role in draft beer systems by preventing excessive foaming during the dispensing process. These devices can accumulate residue, yeast, or beer stone over time, which can hinder their function and affect beer quality. Proper maintenance often requires disassembling these devices for thorough cleaning to ensure the system operates efficiently and delivers clean pours without excessive foam.

Other components like tap handles, beer kegs, and cooling systems also require regular maintenance, but they do not typically involve the same level of detailed cleaning associated with FOB devices. Tap handles can be cleaned externally, but they don't usually get as contaminated internally. Beer kegs often require cleaning through the rinsing of their lines but don't typically get disassembled for cleaning in the same way as FOB devices. Cooling systems should be maintained for temperature control but may not require the disassembly that cleaning FOB devices does, focusing instead on external maintenance and ensuring proper airflow.