Includes: (1) SNAR1 Red Anodized high-quality machined aluminum knob; (1) Roll Pin Removal & InstallationTool,(1) Factory Roll Pin (1) Hex Key. Made in the USA; all parts and tools are included to self-install your STOPKNOB on all Class A Motorhomes or other vehicles that share the same factory yellow parking brake knob. This upgrade provides improved functionality and compatibility; a specifically engineered parking brake lock for air brakes. These air brake knobs seamlessly integrate into your vehicle's setup and are fast and easy to install. How to Use: Engage the lock by turning the easy-to-spin locking wheel clockwise when the vehicle is parked; this prevents the accidental release of the air brake. To release the lock, spin the locking wheel counterclockwise and use the air brake system as normal. A safe precaution for unattended vehicles; especially useful if you have large pets, kids, or while cleaning or servicing. An Alternative to wheel chocks when temporarily parked. Versatile Air Valve Knob: Engineered to accommodate various manufactured air brake valves; provides versatility for different vehicle models. Includes two distinct installation options for replacing the yellow brake knob; all required parts and tools are included for both methods. This high-quality machined aluminum knob replaces OE parking brake knobs, or push pull valve knob; a cost-effective alternative to expensive air brake interlock systems. Offers extra security compared to factory air valve knobs (push-pull valve knob); prevents accidental air brake release. A great alternative to devices like an air brake plunger, air brake clip, or air brake safety clip. Enhanced Compatibility: Designed as a replacement for the dash air brake valve control knob or yellow brake knob; the STOPKNOB offers improved functionality and compatibility. Specifically engineered for Class A Motorhomes with air brake systems and other vehicles using similar valves and yellow OE manufacturer knobs. This Air Brake Lock is crafted from durable 6061 aluminum and is made in the USA. More secure than alternatives like an air cuff lock or air brake plunger securing device. Ideal for replacing factory push-pull valve knobs and parking brake locks for air brakes. Fitment Details: STOPKNOB (SNAR1) is a great enhancement for you Class A Motorhome and vehicles similar air valves including Bendix 284726N & Haldex KN20021, This Model is not compatible with Super C Motorhomes, Commercial trucks, or Buses; For these vehicles, refer to model (SNCB1), which is specifically designed for Super C Motorhomes, Commercial Trucks, Semi Tractors Trailers, Heavy Duty Equipment and Busses. Easily replace your factory air brake knob with the patent-pending Stop Knob for added safety and peace of mind. Designed as a secure locking device for the parking brake in vehicles equipped with air brake systems, the Stop Knob prevents accidental brake releases that could lead to serious damage, injury, or even fatalities. This simple and effective solution offers greater safety compared to alternatives like air brake safety clips, air brake plunger securing devices, or absolute brakes. Plus, it’s a stylish upgrade for your Vehicle with Air Brakes.