Done a little research and unable to find the answer but anyway I found out my condenser drier is leaking from the little white plastic nut on top. Is this a spare part as I can see the drier (decissant) is but unable to find the plastic nut?

I don't think its replaceable 

 

Unfortunately to replace the condensor, its a front end off to get to it due to the way its blocked in. I did mine (once it had been de-gassed) in a few hours, not tricky at all just a case of going step by step

The drier has to be replaced. You can't just replace the white nut. I would spend the extra on a new condenser. I had the same issue last year.

Sent from my Galaxy S5