Today the TAU 7 has decided not to leak !....don't know whether to strip the valve or or see how it goes!
Hi Yana - Although I have been told the Crossman bulbs are lubricated - but I am not sure about the Umerex ones, as I have never seen them - I will try to find out.
As a guide I was told if the bulb is gold coloured - this denotes it includes lube -and usually costs a bit more. It it is silver then it has no lube and should cost less.
This may or may not be true, but the description fits the types I have seen and used so far.