The best composting toilet urine diverter depends on your toilet opening, installation plan, and preferred material. The Throne model is best for buyers who want listed dimensions for both the solids opening and liquid funnel, while the Xastro and wrap-around DIY kit are better for larger openings and custom builds. Frienda’s options are simpler ABS separators for bucket-style or other dry-toilet setups. Compare the listed measurements with your toilet design before choosing.
| Product | Best For | Notable Detail |
|---|---|---|
| Throne Urine Diverter | Bucket toilet builds | Specified opening and funnel dimensions |
| Xastro Upgraded DIY Kit | Large-opening DIY builds | 365 × 276 mm opening |
| Wrap-Around DIY Kit | Custom installations | Includes cutting template and drain hose |
| Frienda ABS Diverter | Simple replacement or DIY setups | 13.5 × 11.4-inch ABS separator |
| Frienda Semi-Circular Diverter | Buyers seeking a semi-circular design | ABS construction and listed size |
Throne Urine Diverter for DIY Toilets
Best for: Builders making a composting toilet around a 5-gallon bucket who want clearly stated opening dimensions. The product is described as having a 10.5-by-8-inch liquid funnel with a 4-inch depth, plus a 9.25-by-7-inch solids opening. It is made from 0.25-inch-thick LLDPE, which the listing describes as heavy-duty construction.
The listed wide funnel and deep bowl make this a useful option to compare when liquid routing and a roomy opening are priorities. The product also includes DIY plans, according to its name.
Limitation: Confirm that the funnel and solids-opening measurements suit your planned seat, enclosure, and drainage arrangement; the listed dimensions may not fit every DIY build.
Xastro Large-Opening DIY Diverter
Best for: DIY builders who want a larger opening and a custom toilet height or footprint. Xastro lists an opening of 365 by 276 mm, thickened and widened edges, and a mirror-finish ABS surface. The product is presented as a cost-conscious alternative to buying a complete pre-made toilet, with the flexibility to build around the diverter.
The smooth finish is described as easy to clean, and the enlarged opening may be a better fit for buyers who find smaller separators restrictive. Choose this if the stated dimensions fit your board and toilet layout.
Limitation: This is a diverter kit, not a complete toilet. The supplied feature information does not specify a drain hose or cutting template, so check the listing for included installation parts.
Wrap-Around Diverter With Installation Kit
Best for: Buyers who want a large ABS separator and installation aids for a custom toilet. The listed opening is 365 by 276 mm. The package features include a stainless steel sink lid, drain hose, and cutting-guide sticker. Its description says the sticker is intended to help mark a cutout in a wood board.
This is a better choice than a basic separator if you value a stated template and hose in the kit. The listing describes a mirror-finish surface and reinforced edges, and it identifies bucket toilets and permanent composting toilet installations as intended uses.
Limitation: The large opening requires enough space in the toilet platform. Measure the board and planned seat arrangement before cutting.
Frienda ABS Solid-Liquid Separator
Best for: Buyers seeking a straightforward ABS urine diverter for a composting or bucket-toilet setup. Frienda lists the size as 13.5 by 11.4 inches (34.3 by 29 cm). Its stated purpose is to separate liquid and solid waste at the source and direct urine away from solids.
The product’s relatively simple design may suit a DIY build where the buyer already has a plan for mounting and liquid collection. Choose it if its overall footprint matches your toilet opening and you do not need a kit with a listed cutting template.
Limitation: The provided features do not list installation hardware, a hose, or a cutout guide. Plan to verify what is included before beginning the build.
Frienda Semi-Circular Urine Diverter
Best for: Buyers who prefer the listed semi-circular shape for a composting toilet, RV, or boat project. This Frienda model is made from ABS and measures 13.5 by 11.4 inches, according to the product information. It is described as separating urine from solid waste to help keep the collection area more organized.
Compared with the basic Frienda separator above, this option is specifically described as semi-circular and names RVs and boats among its intended settings. Select it when that shape and stated footprint suit your layout.
Limitation: The feature details do not provide a cutout size or drainage-hose specifications. Confirm the mounting and liquid-routing plan before purchasing.
Buying Guide: How to Choose a Composting Toilet Urine Diverter
Which dimensions should you measure?
Measure the available platform, intended seat opening, and space below the diverter before choosing a model. Compare those measurements with the product’s overall dimensions and, where supplied, its opening dimensions. A diverter that is too large may not fit the board; one with an opening that does not align with the seat may be difficult to incorporate into the design.
Do you need a complete kit or only the separator?
A basic diverter may suit a builder who already has mounting materials and a plan for directing liquid into a container. A kit with a drain hose or cutting guide may reduce the need to source those items separately. Check the listed contents carefully: the products here do not all specify the same accessories.
Which material and surface should you compare?
The listed options include ABS and LLDPE. The Xastro and wrap-around kits describe a mirror-finish ABS surface, while the Throne product specifies thick LLDPE construction. Compare the material and stated design details against your installation needs, and follow the care instructions provided with the product.
How important is opening size?
Opening size affects how the diverter fits into the toilet structure and how it is used. The Xastro and wrap-around models list a 365-by-276-mm opening, while Throne provides separate measurements for its solids opening and liquid funnel. Frienda lists the overall product size, but the supplied details do not specify a separate cutout measurement.
Frequently Asked Questions
What does a composting toilet urine diverter do?
It is designed to route liquid waste away from solid waste at the source. These products describe that separation as a way to keep the collection area cleaner and make a dry-toilet setup more manageable.
Will any diverter fit a 5-gallon bucket toilet?
No. The Throne product name specifically states that it fits a 5-gallon bucket, but other models require their dimensions to be checked against the bucket, platform, and toilet design.
Do all urine diverters include a drain hose?
No. The wrap-around kit lists a drain hose in its features. The supplied details for the other products do not specify one, so confirm the package contents before purchase.
Is a cutting template necessary?
A template can help mark a cutout for a DIY installation. The wrap-around kit lists a cutting-guide sticker; the provided feature information for the other options does not specify a template.