I love how H&S makes a MAC valve for the Infinity/Ultra that intrinsically replaces the stock valve stem, rather than being an add-on extension. I've been making eyes at a Hansa 281, and I've noticed that the valve design looks, in pictures at least, like it might be the same as the Infinity/Ultra (housing shape is different, but the internal interface with the body looks like it might be the same). I'm wondering if that MAC valve stem for the Infinity/Ultra might be compatible with the Hansa. On the one hand, Hansa is owned and manufactured by H&S, so it would make sense if some production line standardization/consolidation is in play. On the other hand, Hansa used to be a separate company, so it'd also make sense if their original designs might have been preserved for the benefit of part back-compatibility. And on the gripping hand, since Hansa brushes use a different type of trigger action, it might also make sense if the valve needs to be different in some way (it's hard to tell, but in some pics I found it looks like maybe the valve pin might be slightly longer on the Hansa, but that could be trick of perspective). Can anyone who owns both tell me if H&S/Hansa valves are interchangeable? Thanks!