Stemco 340-4372 MTIS PSI Aluminum Hub Cap for Grease Packed Trailer Hubs

The Stemco 340-4372 is a cast aluminum hub cap specifically engineered for grease-packed trailer wheel ends equipped with the Meritor Tire Inflation System (MTIS) by PSI. This hub cap features a gray opaque window with no markings and does not include a side fill plug, distinguishing it from oil bath hub cap variants.

Key Features:

• Cast aluminum construction for superior heat dissipation and durability
• Designed for use with HM518445 bearing applications
• 6-3/4" bolt circle with six 5/16" bolt holes
• Gray opaque inspection window without oil level markings
• PSI tee fitting and flapper valve install in center of hub cap (sold separately through Meritor or PSI)
• Includes Stemco 330-3118 hub cap gasket
• Height: 2-11/16", Inside Depth: 1-9/16", Flange ID: 4-3/8", Flange OD: 7-1/4"

This hub cap provides reliable wheel end protection for commercial trailers running automatic tire inflation systems. The cast aluminum body prevents warpage and ensures long-lasting performance even under demanding operating conditions. Compatible with grease-packed hubs only; for oil bath applications, see part number 343-4372.

Cross References: 3404372, 1499, 3143700, 7843-3404372