LiquaGen Water MANUAL WATER FILTER VALVE- RINSE/BACKWASH/FILTER SETTING This product has 3 settings-RINSE, BACKWASH, & FILTER. 1"NPT, Metal Handle, 2.5" Base. This system is excellent for Iron Filter Systems & Calcite Filter Systems. It can be used for ANY filtration system needing backwash and rinse cycle. The Manual Water Filter Valve fits Regular FRP/ Mineral Tank w/ thread of 2. It can also fit in any water filter valve which fits a 2  tank-for example FLECK,CLACK,AUTOROL,WATTS etc.