For grease applications, the 342 series Dirt Exclusion hub caps provide the same 340 casting without a side fill plug, plus a solid window with a sintered metal vent for venting purposes. To further support grease wheel ends, STEMCO developed the 352 series Solid Aluminum hub caps with a duckbill vent inserted in the face of a solid hub cap.
Has Prerequisite
![A man applying grit guard to a wheel end](https://www.stemco.com/wp-content/uploads/2020/07/tqm-grit-guard-thumb-300x168.jpg)
![A man applying grit guard to a wheel end](https://www.stemco.com/wp-content/uploads/2020/07/tqm-grit-guard-thumb-300x168.jpg)
TQM Wheel End Part 2 – Grit Guard® Installation
Requires TQM Wheel End Training Part 1