The present invention discloses air compressor equipment for vehicles and, more particularly, a sealant dispensing unit that can work under upright orientation as well as inverted orientation so as to repair and inflate a punctured tire. The sealant dispensing unit has a first hose connector and a second hose connector. In use, the sealant dispensing unit allows a user to select upright orientation or inverted orientation for an operation, whereby the hose connectors of the sealant dispensing unit may serve as a channel for receiving the high-pressure air or serve as a channel for delivering the chemical sealant. A professional can perform a box design in cooperation with the sealant dispensing unit easily.