Motorad Safety Lever Radiator Cap Safely remove your radiator cap by venting the pressure from the cooling system before removing the cap. Manufactured to meet all OEM specifications. Designed to be easy to install and remove. Manufactured from high quality components with proper relief and vacuum valves. Quality tested to stand up to even the most demanding automotive cooling systems. Coolant Recovery System: Open, Closed System Lever Type: Safety Lever Pressure Rating: 4 PSI Prop 65: WARNING: Cancer and Reproductive Harm - www.p65WARNINGs.ca.gov SAE Pressure Range: 3-5 PSI Width: 2.25 in Cap Depth: 1.48 IN Material: Stainless Steel, Plastic, Rubber Quick Pressure Release: Yes