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The whole sentence is as follows:
To change the setting on either pressure, use the following procedure:
Here is some context to help you help me:
The type DHV valve has option of setting two different opening settings of the pressure unit. These settings can be seen on the two marking plates on the top cover.
My question is: does either mean "choice between both possibilities" or "both"?
It is from a manual about pressure/vacuum valve type DHV.