1.6 GPF Tank from the Wellworth Collection Exceptional Performance. Exceptional Value. Wellworth toilets have been an American benchmark for innovation and performance since 1936. With a new design in 2011, the Wellworth toilet brings and elegant flare that complements a wide range of bathroom designs. 12" (30.5 cm) rough-in Class Five - provides tremendous bulk waste flushing performance and best-in-class bowl cleanliness 3-bolt Installation - Three pre-installed tank bolts save installation time Canister flush valve provides smooth flushing actuation with consistent water usage, flush after flush 1.6 gpf Polished chrome trip lever