Imagine two sinks sitting side-by-side, connected by a sneaky little pipe called a cross-over or continuous waste tee. This is the ninja of plumbing: it lets water from both basins flow into one main drain without fighting each other. Genius, right? But here’s the kicker—only one sink usually gets the disposal, and that changes everything.
In most diagrams, the disposal unit lives under the larger or designated rinsing sink. That’s the sink where you scrape leftovers into the abyss. The other sink (the soaking station) drains separately, then meets the disposal’s path via that waste tee. You’re basically creating a Y-shaped escape route for all your cooking sins.
The Positioning Game: Left vs. Right
Here’s where the irony kicks in. If you’re right-handed (like 90% of us), you probably want the disposal on the right side—because that’s where your hand naturally scrapes. But guess what? Many prefab double sinks come with the disposal on the left just to mess with you. Thanks, appliance gods. You can customize this, but it means rethinking the trap setup.
The trap is that curved pipe under the sink that catches lost forks and hope. On a double sink, you’ll see two traps on a continuous waste system—one per basin—that join into a single line before hitting the main wall. If the disposal is on one side, that side’s trap connects directly to the disposal outlet, while the other trap has a longer journey to meet it. Pro tip: Keep the disposal’s trap as short as possible to avoid clogs.
