It really depends on the toilet, as all of the major brands differ to
some extent, A regular cheepo toilet from the local hardware store might
take a 2 1/8 in dia. ball, a Toto might take a 2 1/2 in. ball, and there is
an Aussie toilet that I've see take down several baseballs or a small
grapefruit ( 4" trapway)
Most Aussies I've met over the years were nice people, except for one
individual,...he's probably in jail :) The Aussie toilet I saw though had
exceptional flushing capacity, They've needed to perfect the 1.6 GPF because
they have a chronic shortage of water in that country.
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