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different types of spark plugs.

porcelain spark plug. The ceramic material used in porcelain spark plugs provides excellent insulation, preventing the electrical current from leaking out and ensuring a consistent spark every time.
Almost every lip seal is constructed to have a flexible inner part that creates a dynamic seal on the moving shaft, as well as a hard outer casing that statically matches the machine-end cover. The flexible part is made from different grades of rubber, while the hard part is made of light-gauge metal or strong plastic.


Rotary Wheel Of Auto Parts
As shown in Figure 1, sealing devices come in two types: contact and non-contact.
Oil seals are among the major contact type sealing devices.