I hear you on the air gap mess—cleaned out one last week that looked like it was growing its own ecosystem. High loop’s been my go-to for older kitchens, especially if you don’t want to play “find the mystery pipe” behind ancient cabinets. Dedicated lines are solid, but man, retrofitting can turn into a can of worms real quick. At the end of the day, it’s all about what fits your setup and keeps the water where it belongs... and your sanity intact.
High loop’s been my go-to for older kitchens, especially if you don’t want to play “find the mystery pipe” behind ancient cabinets.
Yeah, the high loop trick has saved me more than once. I get the appeal of a dedicated drain line, but honestly, unless you’re already gutting the kitchen, it feels like overkill for most setups. I’ve seen some pretty gnarly air gaps too—one had this weird sludge that looked like it belonged in a sci-fi movie.
I’m always a little skeptical about how much extra protection you really get with a dedicated line versus a well-installed high loop. Maybe it’s just me, but I’ve never had a backup issue with the high loop, as long as the sink drain stays clear. Retrofitting those lines, though... yeah, that’s a rabbit hole. You start pulling cabinets and suddenly you’re dealing with 50-year-old plumbing that crumbles if you look at it wrong.
Guess it comes down to how much hassle you’re willing to take on. For me, if it ain’t broke, I’m not fixing it.
Had a call once where the homeowner swore their dishwasher was “possessed” because it kept backing up. Turned out, the high loop was just dangling like a sad spaghetti noodle under the sink. Quick zip tie fix and it’s been golden ever since. I get why folks like dedicated lines, but unless you’re already knee-deep in a remodel, I’d rather not tempt fate with 1970s copper. Sometimes simple really is better... or at least less likely to end with me covered in ancient pipe goo.
I’ve run into that “possessed” dishwasher scenario more times than I can count. High loop or air gap issues are way more common than people think, and honestly, a zip tie or a quick re-route usually does the trick. Dedicated drain lines have their place, but unless you’re already opening up walls or replacing old copper, I’d stick with the under-sink hookup too. Less invasive, less risk of disturbing something that’s been working for decades... and way less chance of finding out what’s been living in those pipes since the ‘70s.
Under Sink Hookup Vs. Dedicated Drain Line: Which Is Better For Dishwashers?
You nailed it with the “possessed” dishwasher bit—sometimes I swear they’re auditioning for a horror movie with all the gurgling and backflow. High loop or air gap issues are sneaky, and it’s wild how often a simple zip tie can save the day. I’ve seen folks go full demolition mode just to fix a drain, only to realize it was a sagging hose under the sink causing all the drama.
I get the appeal of a dedicated drain line, but unless you’re already gutting the kitchen, it’s usually more trouble than it’s worth. Plus, who really wants to discover what’s lurking in 50-year-old pipes? I once found a petrified mouse in an old copper line—talk about a surprise you don’t want before lunch.
Honestly, if the under-sink setup has been working and you’re not dealing with constant clogs or weird smells, why poke the bear? Sometimes less is more... especially when it comes to plumbing and whatever ancient mysteries are hiding behind those walls.