Our Complete Urine Separator 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.
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.
Better Than the Separett — Our Customers Say So
"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 30mm 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: 284mm
- Depth: 130mm
- Outlet hole: 30mm external diameter
- Pipe connection: 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.
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 30mm. We therefore recommend a 32mm pipe, also sold as 1¼".
