My Designer has a place under the sink for an inline water filter. I never use that location for a filter since I have a "whole home" filter that is inline with the water coming in from the pedestal outside. But I did use this inline water filter location to install an accumulator. Works well and was just "screw it on" since the fittings were already there for the inline filter.
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof