I'm not sure, but I got mine replaced at Valvoline (Instant Oil Change place) for $9.00 - so you could just roll in there, pay them $9 and make it their problem.
I may be remembering inaccurate info here, but I could have sworn that somewhere in my owners manual there's something that says the dealership will give you a free pcv valve after 100k miles. Does that sound familiar? I should probably look stuff up before I post... :redface:
Duratec ones, at least for my gen4, are not listed in the parts catalog at autozone and such stores. I had to get mine from the dealer for 9 bucks a pop.
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