This park knob kit fits Mack air brake systems and includes the spiral pin needed for installation, sold as a one-each pack. On the dash or transmission control, the knob lets the driver lock the transmission in park to keep the truck from rolling. It is built as a replacement for the Mack-branded original.Interchanges:Mack 745-291142LVK-1369FeaturesPark knob for air brake systemsKit includes system park knobKit includes spiral pin (LPN-5119, Mack 31AX629)Sell pack: 1 eachAir Brake Parts categoryTech SpecsSell Pack: 1 EachKit Contents: System Park Knob (LVK-1369-001); Spiral Pin (LPN-5119, Mack 31AX629)