Bought new house with an old pool. Pool has one skimmer, which resembles an old style Anthony skimmer; however, the diverter adjustment appears backwards when compared to others' on this forum. There appears to a be a rubber/metal plug at the bottom, completely blocking the main drain (please see the photo). As a result, all the suction to the pump, which is through a pipe above and perpendicular to that main drain plug, is via the skimmer. I'd like to be able to adjust the main drain suction so that it does not cause my suction cleaner hose to collapse and to improve water circulation. First, can anyone confirm that this is an Anthony skimmer? If so, can I remove that rubber/metal plug and purchase a diverter? Thank you in advance for your assistance.