Can anyone tell me what this little blue valve is and what it does? Accidentally moved it and not sure if it should be tight or loose??

Photo off Internet, but can see the valve in the middle.

My engine nowhere near as sorted.

Cheers

Hello the pic isn't attached, where abouts is it in enging bay located ?

As above, no pic.

Could be anything from a manual boost controler to anything.

Would advise not touching it unless you know what your doing.

Soz, thought I'd attached.

Should be able to make it out....just to the left of the oil filler.

Cheers

Air con pipe recharge valve?

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Nice one... Best make sure it's tight, but guess it's the same deal as a tyre valve, closed unless the centre pin is pushed open. Blue cap just to keep it clean. Cheers