You do not have to use a Denso oil filter, you can use any brand filter you want. Go to any auto parts store and they will cross-refernce your Onan filter to another brand. Purolator, Wix, & Bosch make excellent filters. I looked this filter up on the Purolator cross-reference chart and came up with no results. Is it possible you're using the wrong numbers.
PF4967
yes
Salt is not a filter, it is added to pool water to allow a chlorine generator to operate.
0D9723
Yes
Oman generator
Wix WA10555
onan marquis 5500 generator
Fleetguard AF1913 fits a Kohler Generator
One can purchase a pop filter at many different stores. Some stores one can purchase a pop filter is at Wal-Mart, Guitar Center, Musician Friend, and Next Tag.
Donaldson Duralite, ECC045001
PURCHASE A 1" PLEATED FILTER IN EITHER MED. OR HIGH EFFICIENCY GRADES. SAME AS A "RUUD" BRANDED FILTER. LC