I have a used M-6880-A50 for sale. It needs new O-rings because the originals are pretty hard (you can buy replacements through McMaster Carr), but I will include the old O-rings. HOWEVER this version doesn't need a filter adapter to work like the new version. Has some surface rust on the large bolt that can be cleaned up, but otherwise in working condition.
$80 shipped, but make an offer! Located in Atlanta.
$80 shipped, but make an offer! Located in Atlanta.