Page "Wireline (cabling)" Paragraph 29
from
Wikipedia
A line wiper operates in much the same way as a pack-off sub, except that the rubber element is much softer.
Grease pumps exert force on the rubber element until a light pressure is exerted on the wireline, cleaning grease and well fluid off the line in the process.
Page 1 of 1.
1.966 seconds.