This Genuine Webasto fuel line pick-up tube is used to tap a fuel tank to provide an independent fuel supply for a Webasto heater. This standpipe is typically installed into the top of the fuel pump sending unit.
I ordered this part for my gas Wabasto. Installed it in a 2001 Ford E250, it all worked out perfectly. I drill a hole for it on top of the gas pump plate, after removing it from the tank of course. Trimmed to fit the depth of the tank.