Description
What is OTR:PL5990?
OTR:PL5990 is a vented hub cap plug used in wheel‑end assemblies on trucks, trailers, and other heavy‑duty vehicles.
It is typically a 1 1/8-inch rubber vent plug designed to allow pressure release in hub caps while preventing water and debris from entering.
Cross References / Equivalent Part Numbers
PL5990 (OTR Products)
Stemco 3595990
Multiple OEM and aftermarket equivalents listed across trucking brands.
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