filter means 60 thus there is provided a fluid path from the interior of the basket 24 through the inlet openings 74 in the skirt portion and through annular channel 42 through the outlet opening 64 through the inlet channel 66a and into the vertical channel 66 up into the cavity 58 and through the outlet openings 76 as seen in fig3 the liquid has two flow paths between inlet openings 74 and the outlet opening 64 between the annular channel 42 and the vertical channel 66 as viewed in fig3 these two paths are the top portion of channel 42 being designated 42a and a bottom half of channel 42 being designated 42b a flapper valve means 84 is retained by means of a pivot pin 85 provided in a first end 86 of valve means 84 and secured to the exterior circumferential wall 44 of the skirt 32 this flapper means 84 which is also shown in fig5 extends across the width of the annular channel 42 and effectively separates portion 42a from portion 42b a second end 88 of the flapper means 84 can be sealingly seated in a recess 90 provided at the junction of vertical wall 68 and wall 45 at one.