Model Compatibility: Fits 2017–2020 Armada and 2011–2020 QX56 and QX80 rear suspension air compressor applications only. Functionality: Restores rear suspension air compressor for vehicles specified in the model years and trims listed in the title. Installation Purpose: Designed as a direct-fit replacement for the rear suspension air compressor on compatible Armada, QX56, and QX80 models. Year Range Coverage: Supports model years 2011 through 2020 for QX56 and QX80, and 2017 through 2020 for Armada exclusively. Location Specificity: Intended for rear suspension air compressor replacement only, not for front suspension or other vehicle systems., Manufacturer: NwGWcebQU