This RAM Mounts RAM Vent-Temp Round Vent Adapter for the RAM Vent-Temp temperature module accessory installs to the 50' hose that comes with the RAM Vent-Temp kits. Add or replace this vent cover to accommodate the shape of your vehicle's A/C vent for optimal air flow when installed. This vent cover covers a surface area of 3.67' in diameter, and it includes zip ties to secure to your vent.