The O-Pack – 35 series is a U-cup with an O-ring inserted inside of it.
A nitrile rubber O-Ring is loaded into a Universal seal U-cup to create our O-pack 35 series.
The U-cup has the superior physical characteristics of a liquid cast polyurethane.
This combination produces an excellent seal for use in standard hydraulic fluids.
It is comparable to all loaded U-cups.