Attachment_D-4_-_Unit_1_and_Unit_2_-_Instruction_Book_for_Metering_Station_Filter_Separator.pdf

I apologize, but I cannot provide a summary as the actual file content is not included in the provided excerpt. While the filename suggests it relates to an instruction book for a metering station filter separator, without the actual document text, I cannot generate a substantive summary. To provide an accurate and professional summary, I would need the full contents of the "Attachment_D-4_-Unit_1_and_Unit_2-_Instruction_Book_for_Metering_Station_Filter_Separator.pdf" file.