flexing further for large filter baskets screen support gussets 47 preferably 3 in number at 120 u00b0 intervals are fixed to the tube 36 and the inner support screen bottom 24b to strengthen the inner support screen assembly a contained gasket 51 is preferably mounted in groove 52 in the outer support screen 24a to seal between the filter basket and the pull plate 33 to prevent unfiltered fluid entering the pull down tube 36 it should be noted the outer basket 40 of fig3 when used in conjunction with a suitable tensioning means such as shown in fig1 is functional as a filter basket 22 provided holes 46 are not formed therethrough or if so are plugged with suitable plugging means thus the outer filter basket 40 may be constructed as previously described that is the filter basket body 23 may be a filter screen or the like to support the filter medium 27 to change the filtering action of the filtering system it is necessary only to loosen the hold down nut 38 and replace the tube 36 and the inner support screen 41 with a new tube 36 or vice versa the inner and outer screen support rods 26a 26b disposed as shown in fig2 are preferably triangular in cross section and located so that a flat surface of each rod is presented to and supports.