The toilets least likely to clog are models equipped with extra-large, fully glazed trapways and high-performance flush valves, such as the American Standard Champion 4 and the Toto Drake. The Champion 4 features an expansive 4-inch piston flush valve and a 2-3/8-inch fully glazed trapway capable of passing massive solid waste effortlessly. By eliminating narrow constrictions inside the porcelain trap and accelerating water velocity, these elite models virtually eliminate stubborn household clogs.
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