Hi Dave here is the part number for the check valve, after your PM I went searching
Part No 3931070550 Provent 200
Part No 3931050950 Oil Separator Element
Part No 2400843621 Check Valve
Part No 2307932101 O-seal
I got this from this web site
MANN FIlters - MANN Provent 200
Baz.


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