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Under Sink Hookup vs. Dedicated Drain Line: Which Is Better for Dishwashers?

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Posts: 13
(@cloudp87)
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- Totally agree, the under-sink hookup is just asking for trouble long-term.
- I get the appeal of saving money upfront, but honestly, I spent more on drain cleaners and wasted time than I’d like to admit.
- When we remodeled, I hesitated on the dedicated line because of cost, but it’s been worth it—no more mystery leaks or gross clogs.
- Air gap is a must, in my opinion. My cousin skipped it and ended up with a dishwasher full of gunk... not pretty.
- If your current setup isn’t giving you grief, I’d probably hold off too. But if you’re already opening walls or redoing plumbing, might as well do it right the first time.
- Only thing I’d add—if you’re on a tight budget, maybe just keep a close eye on the trap and clean it out regularly until you’re ready for the upgrade.


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Posts: 14
(@storm_gamer)
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“Air gap is a must, in my opinion. My cousin skipped it and ended up with a dishwasher full of gunk... not pretty.”

That air gap story cracked me up—seen it more times than I care to admit. Folks think it’s just an extra bit of chrome on the sink, but man, it saves you from some truly nasty surprises. I’ve fished out everything from pasta to what I’m pretty sure was a small science experiment from dishwashers that skipped the air gap.

I get the budget thing, though. Not everyone wants to rip up their kitchen for a dedicated line. But if you’re already knee-deep in drywall dust, just do it. Trust me, your future self (and your plumber) will thank you.


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shadow_phillips
Posts: 15
(@shadow_phillips)
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“I get the budget thing, though. Not everyone wants to rip up their kitchen for a dedicated line.”

That’s the part that gets me—my wallet starts sweating just thinking about “dedicated line.” I went with the under-sink hookup because, well, the only thing I like less than plumbing is paying for plumbing. Haven’t had any disasters yet (knock on wood), but I do clean out the trap more than I’d like to admit. Maybe one day I’ll get fancy, but for now, my air gap and I are in a committed relationship.


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gadgeteer95
Posts: 7
(@gadgeteer95)
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Honestly, you’re not alone—most folks stick with the under-sink hookup for exactly that reason. It’s cheaper and less hassle. Just keep an eye on that trap and make sure your air gap stays clear. Dedicated lines are great, but not always worth tearing up a kitchen for.


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medicine_becky6556
Posts: 3
(@medicine_becky6556)
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Yeah, I get that. My uncle’s kitchen has the under-sink setup and it’s been fine for years—just a quick check every now and then for gunk in the air gap. I’ve seen dedicated lines in new builds, but honestly, unless you’re already remodeling, it feels like overkill.


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