The is more than just a seal; it is the first line of defense against the hostile environment. For hydraulic systems operating in dirt, dust, and debris, switching from a standard rubber wiper to a WUNF 400 can extend cylinder rebuild intervals from 1,000 hours to 5,000 hours or more.
If you are looking for technical specifications for a mechanical "solid guide" (like a linear rail or bushing), there is no widely recognized industrial part under the name "WUNF 400." You may want to check if the name is a misspelling of a manufacturer like or a standard part like Could you clarify if you're looking for a mechanical part media file wunf 400