This 4 ft. hose with adapter allows you to connect your small appliances that utilize compact 1 lb. propane tanks and give them the ability to connect to a larger 20 lb. propane tank. This provides the flexibility to be able to grill longer without any interruptions. This hose can also be used to extend the length of your existing hose for a more comfortable grilling experience. With quick and easy, tool-free installation, this is a no-brainer.