We just installed a memoirs stately 1 piece toilet in my boys bathroom. I thought I did my homework on this site and got one with good flushing strength, but they have managed to clog it. My problem is that my 2 current plungers are not big enough to seal the hole--it has a round area, but towards the front of the toilet there is a rectangular shape too, and the combination of both areas is bigger than my plungers and we cannot get a seal. I called Kohler and they only recommend a korky for the Cimmeron (sp?) model. I googled korky and that is the plunger that i have. Help!