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You'll have to go to a salvage yard.
Buy something that was made before 1970.
You only need to go pre-1994, when after that the low-flush residential toilets became mandatory. 3.4 gallon flush before, rather than the newer 1.6 gallon flush. Power-assisted also really helps.
Not sure it is legal to put in one of the 3.4 gal bowls today. I pulled my first plumbing permit in 1993 (I was straight out of college), and thus was grandfathered for my first house until I finished building it, about 5 years later, so I could use the high-flow toilets.
I bought a old house that was in forclosure that someone was trying to flip but failed. There was water damage here and there because the toilets had clogged all the time.
I finally had to go find old toilets that flushed 5 gallons to fix the problem. Even the high pressure ones didnt do the trick. Many old houses are designed expecting the 5 gal flow from the toilet.
I bought a old house that was in forclosure that someone was trying to flip but failed. There was water damage here and there because the toilets had clogged all the time.
I finally had to go find old toilets that flushed 5 gallons to fix the problem. Even the high pressure ones didnt do the trick. Many old houses are designed expecting the 5 gal flow from the toilet.
"Old house"
The principles of DWV haven't changed in many, many, decades- but materials have.
So, when you say "old house" that sounds like cast iron pipe. Ever seen the inside of 50-100yo cast pipe? It's no wonder you think you need 5gals to flush.
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