We’ve all been there. Staring in helpless horror at the relentlessly rising water of a toilet you just attempted to flush, praying the liquid doesn't crest the rim.There’s only one way out: A plunger.We mounted a toilet atop a homemade test rig complete with an elevated platform and transparent plumbing beneath so that we could visibly measure several plungers' performance on a clog. In the end, one plunger—the Korky 99-4A Max Performance Plunger—had the power to out-plunge all the others.