Originally Posted by ROBERTSUNRUS
Hi, if anything like mine, these rods should have a "T" handle on them. The one on the right should be for the black tank and one on the left should be for the gray tank. [Note: pull to open and push to close]
Once you know for sure which is which, label them! Black electrical tape around the black tank handle, gray duct tape around the gray tank handle. Especially since the black electrical tape has a different texture than the gray duct tape, so you can tell by sight AND by feel for when you have an early-morning departure and barely enough daylight to distinguish colors.