The problem with the accumulator is the air gap will still break any pressure from the accumulator. Think of it like this… The TM has water pressure from either the pump or city water through the pipes, flowing out of a faucet into a basin and down the drain, and then into the toilet. It doesn’t matter what the pressure is coming out of the faucet, it will never build pressure going down the drain.
Here’s a better picture of what I mean by air gap.
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