Theres a pipe with a one way valve in which you could change as well and it is under £30 so it's not too expensive. I damaged mine when I fitted my OCC so I ordered a new one not long ago.
It looks like this:
Part number 11157553949
Not 100% sure how the PCV valve can cause a puff on startup but I'm guessing a faulty valve could allow oil to drip back into the engine overnight.