Ah, that's ok then. These ones had the clear seal on them.the lpr one can also come away but the inline one is more common due to the adjuster hitting it directly.
the older models had a black rubber disc on top, where as the newer ones have a milky/white/clear seal.
It was easy to spot the LPR one, as when I took the LPR cap off, there was nothing on the end of the piston!
It was sat, nice and central in the middle of the LPR body. Apparently the guy had noticed any real problems!