Campbell RV Pre Tank Filter System Disposable - Filter And Hose. This easy-to-use system includes a 10" long High-Flow Disposable Filter and a 12" FDA-quality drinking water hose that connects the filter to the RV water inlet. Standard 3/4" RV water hose connects the inlet side of the filter to the portable water supply. Campbell Manufacturing's RVDH-34 only includes the filter and hose for the RV Pre-Tank Filter System (Disposable). Features of Campbell RVDH-34 RV Pre Tank Filter System Disposable - Filter And Hose Only includes filter Flow (GPM): 3 Pressure Range (PSI): 30-125 Temperature Range: 40F-100F Inlet/Outlet Connection: 3/4" Package Contents: Campbell RVDH-34 RV Pre Tank Filter System Disposable - Filter And Hose Campbell RVDH-34: RV Pre Tank Filter System Disposable - Filter And Hose