Sometimes that indicates a different version. There are at least 2 versions of the 2500, but the only known difference is the presence or absence of number markings on the nozzle selector plate. Therefore, it shouldn't matter with 2500s. With certain models like the 2100, it was usually MK2 if facing screw-side outward. However, the way it's facing should not be relied on to identify a version, because not every screw-side 2100 is an MK2.
marauder wrote:You have to explain things in terms that kids will understand, like videogames^ That's how I got Sam to stop using piston pumpers