What this is for, is to pretty up and seal a hole that you drill in your floor so you can run a propane hose into your camper or RV. I purchased a Camco propane brass 4 port tee that came with 12ft Hose which allows for a connection to propane appliances like the Big Buddy heater. I didn't have the ability to re-crimp connectors on to the rubber line so I ended up using a 1 1/4 inch hole saw to drill a hole into the floor. This piece encloses the hole so that it keeps mice and other bugs out.

Link to Camco 59123 Tee Kit: https://www.amazon.com/Camco-Connection-Auxiliary-Appliances-59123/dp/B0014JG7RQ/ref=sr_1_1?keywords=camco+59123&qid=1578350079&sr=8-1