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Just wondering, since I haven't seen a house in decades that had a dishwasher but didn't have a sink-drain grinder.

I have heard that connecting it this way is partly done so there's an air gap between dishwasher and drains, and I'm guessing that installing without the macerator might require a vacuum breaker or something of that sort... but I'd sorta liks to know for sure.

(My place has both, but I'd really be just as glad to jettison the macerator.)

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  • A disposal is NOT a replacement for an air gap. An air gap is still needed even when a disposal is used. – JPhi1618 Dec 21 '15 at 19:09
  • Here's another question that's basically the same: diy.stackexchange.com/q/15021/43874 – JPhi1618 Dec 21 '15 at 19:12
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I have had several houses with a dishwasher but not a garbage disposal. I don't think it really changes the installation that much... the dishwasher waste pipe connects to the sink drain before the trap.

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If you want to plumb the dishwasher somewhere there isn't a sink already, you need to install a trap & standpipe, similar to the way a washing machine is done.

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  • Thanks for the sanity-check . If/when the disposal dies, I'm inclined to just put in pipe. – keshlam Dec 21 '15 at 5:09

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