Yes mine fills with RV A/F after I remove the filter.
When I de-winterize , I remove the housing and save that A/F for next season, install the empty housing, flush the system then remove and sanitize the housing again before installing a new filter.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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