I would have said cylinder drain cocks but looking at the photos in the album it doesn't seem to have them fitted. On Pansy it's usual to have just one drain cock at the back of the valve chest cover. There does seem to be a blanking plug in the position I would have expected the drain cock to be so maybe it's been removed?
It also looks as though the loco has dummy sanding gear fitted so the lever could be a dummy lever for that?
John