I just recently purchased an 06 Outback LS and it’s been awesome. I was just cleaning it tonight and took the engine cover off just to check all the fluids and reattach the blower hose that fell off and noticed a piece of pvc piping with a ball valve that is open going into a fitting under the rear seat. I thought that the gas tank was located there. Any chance anyone would know what this pipe/valve would go too?