This is our 4" Washout CLAMSHELL Skid. Easily mounts to hoses and cables with just two screws. The Clamshell features an array of high-temp silicone rubber grips on the inside. These grips can be taken in our out to ensure the best fit to your equipment. The 4" Clamshell Washout shape comes in three sizes. BLUE For 1/4", GREEN for 3/8" and PURPLE for 1/2" ID hoses and cables.