The Stemco Hub Cap 340-4370 is designed for use with grease-packed hubs, commonly found on semi-trailers equipped with the Meritor Tire Inflation System (MTIS). This hub cap does not feature a pipe plug and is cross-compatible with various other part numbers, ensuring versatility in replacement scenarios​.
Stemco PSI Grease Hub Cap
$32.17
MTIS/ PSI, 6 Vent Holes, Grease Hub Cap Without Oil Port, For Meritor TN/TQ Axles and Hendrickson HN Axles