Rubber caps have several common uses in industrial production.
Firstly, they protect the ends of fasteners such as screws and bolts from corrosion and damage.
Secondly, they can seal pipes and openings to prevent liquid or gas leaks.
Thirdly, in electronic equipment, rubber caps protect plugs and interfaces from dust and moisture.
Fourthly, in some mechanical parts, rubber caps can act as shock absorbers and buffers.
Fifthly, in chemical experiments, rubber caps can be used to seal reagent bottles and other containers.