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Hi all...looking for some help locating the breather or vacuum breaker that screws into the lid of the M149. I run the NSN and part number from the TM ( 8741778 and 4730-00-168-2073) and find nothing that helps me identify it so that I can find an alternative. I also did several searches using a combination of water buffalo, M149, breather valve, etc. with no results. What am I missing? Any help with a link or common name to help my search would be appreciated.