Everything you need to know to upgrade your compost toilet and skip the bottle.
If you're looking for a low-maintenance, high-convenience way to manage urine in your compost toilet system, the OGO™ ORIGIN Drain Kit is your solution. Designed for flexibility, it lets you route urine directly to a greywater tank or outlet—eliminating the need to empty the urine bottle.
In this article, we’ll explain how the drain kit works, what’s included, how to install it, and how to ensure you're complying with greywater disposal best practices.
What Is the OGO™ Drain Kit
The OGO™ Drain Kit is an upgrade that allows you to permanently or temporarily bypass the urine bottle. Instead of collecting liquid waste in the front bottle, the drain kit diverts it downward into a 1-1/4" PVC connection—so you can route it wherever your system allows.
This is especially popular in:
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Full-time van builds
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Tiny homes with greywater tanks
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Marine or cabin installs with floor drains
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Custom systems where bottle dumping isn’t ideal
The best part? It’s fully reversible. You can go back to using the bottle at any time.
What’s Included
Each kit comes with:
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A top-mounted adapter inside the toilet
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A 1-1/4” PVC stub for routing beneath the unit
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Printed installation instructions (and digital copy)
What you’ll need:
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#2 Phillips screwdriver or drill
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PVC primer/glue (optional)
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Additional PVC fittings or hose to connect to your drainage system
How to Install the Drain Kit
Installation is quick and tool-light. Here’s how it works:
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Remove the urine bottle and access the internal front compartment.
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Install the included drain fitting in place of the bottle insert.
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Attach the drain hose or PVC pipe underneath using the provided stub.
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Route your line to your chosen greywater disposal point.
Tip: Leave the bottom PVC connection loose if you
Is It Greywater or Blackwater
The OGO™ Drain Kit only handles urine, which means it’s classified as greywater, not blackwater.
Here’s the difference:
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Greywater = water from sinks, showers, laundry, and urine (no solids)
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Blackwater = contains feces and flush water
Since your compost system keeps solids separate, the drain kit qualifies for greywater routing in most regions.
Where Can You Legally Drain Greywater
Laws vary—but here’s the general rule of thumb:
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Legal: RV park dumps, septic tank inlets, greywater-approved plumbing, sewer access
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Not always legal: Ground dumping, drainage near food sources or public waterways
We recommend checking with:
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Your local building department
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Zoning/planning offices
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Public health agencies
Final Word
The OGO™ ORIGIN Drain Kit is a simple but powerful upgrade. It turns your compost toilet into a true long-haul system, saving you the mess and time of frequent bottle dumps. With flexible installation, reversible setup, and safe greywater disposal, you’re in control of how your toilet works for your lifestyle.
Less dumping. More doing. Stay clean, stay mobile, stay off-grid.
Need help planning your drain line or finding the right fittings? Reach out—we’re happy to help you customize your setup.