Ozzy, I think you are mistaken. There is no bottom connection to either atomiser - they are the rectangular blocks, each with a steam feed into the top and oil feed and atomised oil outlets on the front and back. The steam supply to both is from the angle valve on the RHS of the smokebox (with the locked hand-wheel) and is taken down to a splitter/valve between the frames. The valve is operated by the cylinder drain cock linkage so that there is no steam supply to the atomisers when the drain cocks are open. From the valve, a steam supply is taken to each side of the loco, emerging just behind the saddle, and connected to the top of the atomiser blocks. As I said, the drivers side has a bulkhead mounted tee to supply heating steam to the forward of the two mechanical lubricators, as shown in this photo. I've had quite a bit of personal experience assembling and disassembling these types of atomisers on our loco as we've had problems with the steam back feeding condensate to the lubricator, despite three non-return valves in the system. A right pain. Not that any of this matters on our models as it's all just cosmetic. Dave.