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Complete Urine Separator for Compost Toilet, ABS Plastic Urine Diverter, Dry Loo
Our Complete Urine Separator Diverter (also called a urine diverter) is the most popular component we sell — handmade in Wales from solid 4mm ABS plastic, and built on over 20 years of experience making urine separators for DIY composting toilets and dry toilets. Whether you're fitting out a self-build eco-toilet, a campervan, a glamping cabin, or an off-grid retreat, this is the single most important part you will fit. It transforms any composting toilet from smelly and difficult to manage into clean, odour-free, and genuinely pleasant to use.
Fast, Hassle-Free Delivery — UK, EU & USA
We dispatch every order from our workshop in Wales within 24 hours by a fast, fully tracked courier, and we ship to the UK, right across the EU and to the USA. EU orders include VAT at checkout with no surprise import fees or customs charges at your door, and parcels to the USA and elsewhere arrive with no unexpected charges — the price you see is the price you pay. Just as easy and quick as ordering from a shop in your own country.
Why Urine Separation Makes All the Difference
The vast majority of odour in a composting toilet or dry toilet comes not from solid waste but from the chemical reaction between urine and faeces. Keep them separate and the problem largely disappears — solids dry quickly, composting proceeds efficiently, and the ammonia smell disappears. A urine separator is not an optional extra; it is the foundation of a well-functioning off-grid sanitation system.
A UK-Made Alternative to the Separett — Our Customers Say So
Plenty of our customers come to us looking for a Separett alternative: a urine separator that's better made, fits a wider range of seats, and ships fast from within the UK and EU with no import surprises. Here's what they say after making the switch:
"Hiya Paul, I'm just putting the finishing touches to the wetroom — it's a million times better than the Separett ones — well done." — Dean
"Hi, I just wanted to tell you how happy I am with the urine separator. I have had a composting toilet I made myself for about three years. It works great." — Martin D.
"Thanks so much for the urine separator. I had been looking all over the internet and finally stumbled upon your site. Got it today and it works perfectly!" — Jay
Designed for Both Male and Female Users
The geometry of this separator has been carefully researched and refined over more than 20 years to work reliably for all users — something that cheaper or poorly designed alternatives often fail at. The smooth, high-gloss ABS surface sheds liquid cleanly and wipes down in seconds. A removable metal filter sits over the outlet hole to prevent blockages, and the whole unit detaches from the seat platform for periodic cleaning in under a minute.
Handmade in Wales — Consistent Quality, Always in Stock
We make every Complete Urine Separator Diverter ourselves in our workshop in Wales, UK, from solid 4mm ABS plastic. Working directly from our workshop means we control every stage of production and always have stock available — no waiting weeks for imports. Dispatched within 24 hours.
Simple Installation
Fix the separator beneath the toilet seat using screws. Connect the 35mm outlet to standard 1¼" push-fit waste pipe, directing urine to a soakaway, collection vessel, or liquid fertiliser setup. No specialist tools or plumbing knowledge required — straightforward for any self-builder.
Specifications
- Length: 330mm
- Width (front to back): 285mm
- Oval opening: 211mm × 125mm
- Outlet: 35mm external / 28.5mm internal — fits standard 1¼" push-fit waste pipe
- Includes removable metal filter
- Available in Black or White
- Dispatched within 24 hours
Frequently Asked Questions
Here are some common questions we've been asked over 20 years of selling urine separators.
How does this compare to a Separett urine separator?
Our separators are handmade in Wales from solid 4mm ABS plastic and are designed to fit a wide range of toilet seats, including DIY self-builds — not just one branded unit. Customers regularly tell us they prefer ours to the Separett for fit, finish and value, and we ship fast from within the UK and EU with VAT included and no surprise customs charges. We also keep our own stock, so there is no waiting weeks for imports.
Do you always have stock available?
Yes — we make the urine separators ourselves in our workshop in Wales, UK. This means we control production and never run out of stock.
How many designs of separator do you make?
We make two designs: the Compact Urine Separator and the Complete Urine Separator.
What features do the two separators share?
- The internal measurements of both separators are exactly the same — the funnel bowl size is identical, the outlet pipe has the same dimensions, and both are fitted with the same size metal filter.
- Both are made from the same high-quality 4mm ABS plastic.
What are the differences between the two separators?
The Compact Urine Separator is the original design we first made in 2009. It is smaller than the Complete Separator and fills around the front third of the oval space inside the toilet seat. It has a single hole for collecting urine, leaving the space behind open.
The Complete Urine Separator has a rim at the back and an additional opening for solid waste. This opening extends downwards, containing solid waste as it falls so it lands safely in the bucket and the inside of the toilet stays clean. The Complete separator fills the entire oval space inside the toilet seat.
The Complete Urine Separator is supplied pre-cut into an oval shape — no further cutting required. The Compact Urine Separator is supplied square with extra plastic around the funnel curve. You can use it exactly as it is, or easily cut it to a bespoke size using a jigsaw at the lowest speed.
What are the benefits of each separator?
The Compact Urine Separator is smaller and its position can be adjusted — moved slightly forwards or backwards inside the oval opening of the toilet seat — to capture the maximum amount of urine. The Complete Separator sits in one fixed position, as it fills the entire oval space.
The Complete Separator is larger and has a contained area at the back for solid waste, which helps keep the inside of the compost toilet clean.
What are the separators made from?
All Free Range Designs urine separators are made from solid 4mm ABS plastic, in either white or black. ABS is a very strong, durable material; it is also recyclable and easy to clean, with a high-gloss surface.
What pipe size do I need to connect to the separator?
The external diameter of the funnel outlet on both separators is 35mm. We therefore recommend a 32mm pipe, also sold as 1¼".
Related: Building a complete loo? Browse our handmade composting toilets, or see the smaller Compact Urine Separator.
Want something made to measure?
Every piece can be customised â different dimensions, wood species, finish, or a completely bespoke design. Message us here on eBay or visit freerangingdesigns.com for our full range.
About Free Range Designs
We're a small team of woodworkers in Mid-Wales making beautiful, durable pieces entirely by hand. Handmade to order â solid, responsibly sourced timber â personal service from first message to delivery.
Our 100% positive feedback across 5,150+ transactions is something we're genuinely proud of. Any issue, just message us â we always make it right.
Browse our full eBay store âPostage & Information
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Returns accepted within 30 days of delivery. Item must be unused and in original condition.
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