rustystud
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I have never looked, but AMBAC references there "FSA" filter. This information comes from the NOS Hydraulic Head I just bought. It is dated January 1966.Does wix or Baldwin even make a 5 micron filter in the old cannister style filters? Most of them I see that fit the deuce are 10 micron. My spin on's are 6 micron.
The cat filters I referenced are 3 micron nominal. With a way higher efficiency rating of anything else on the market except high end specialty filters that are absolute rated.