Yep I noticed early on the bigger the tank the more likely it was to leak some.cant remember who i asked about the bigger tops for the stm but they did say that the biggest has a bit of a problem holding a vacuum so it does tend to leak a bit
i was looking into them for my stm,s
will be back in a while got to brave the cold and get the chainsaw out need to cut up some more fire wood.
got a couple of trees down on the ground just need to section them up ready for splittin.
kaaaaabrrrrrrrrrrrr