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Answer:
its to show the shape is flat and only flat at the botom and top and you can set it up ther way and it wlll still look the same.
Explanation:
O rings and valve seals are used to block a path to prevent escape of a liquid or a gas.
What is cylinder head?
The cylinder head controls air or fuel flow in and out of the cylinders.
The O ring in cylinder head is placed into a groove to secure them in place. They are compressed between two surfaces to have a seal pack. The O-ring or valve seal creates a air and liquid-tight mating surface.
Thus, O rings and valve seals are used to block a path to prevent escape of a liquid or a gas.
Learn more about cylinder head.
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