not shown to ensure proper positioning of the cone 40 relative to the flapper body 20 in other words the cone 40 is attached and polarized in one position so that the holes or openings 47 in the cone 40 can only be positioned one way which is forward in short the cone 40 is integral with the flapper body 20 and does not rotate lastly the cone 40 comprises a plurality of snap tabs 48 extending outwardly from the outer surface 41 of the upper cone wall 43 the snap tabs 48 are used to maintain the vent band 50 in a position such that the band 50 is rotatable about the upper cup wall 43 but is not able to move vertically relative to that wall 43 the upper cup wall 43 further comprises indicia 140 to indicate to the user that the rotatable band 50 is functionally disposed about the cone 40 in several positions see fig6 the rotating vent band 50 comprises a flat ring like structure comprising a cylindrical band body 52 having an inner surface 51 an outer surface 53 an upper band body lip 58 and a plurality of support ribs 54 as shown in fig9 the upper band body lip 58 is receivable within the second groove 129 of the captive portion.