Sun-Mar™ | GTG Urine Bottle

Increase your Sun-Mar™ GTG's capacity with an additional 8L Urine Bottle

Stay on the road for longer - increase your RV toilet's urine capacity and keep travelling when dump stations or home toilets are not available to empty the GTG bottle

Increase general use capacity  - accommodate extra guests

✓ Package includes the 8 Litre Urine Bottle and one URINE TRAP-FLAP™ with a Travel Plug

The URINE TRAP-FLAP™ acts as an odour trap, preventing odour from coming up the urinal AND creates a tight seal between the urinal and the urine bottle, preventing spillage. Includes a travel plug for transportation and safe storage.

RV Self-Containment Regulations require the toilet to have a liquid capacity of 1L per day per person for a minimum of 3 days.

The GTG Urine Bottle offers 8L liquid capacity, providing 4 days self-containment for 2 people.

Additional bottles offer increased capacity. Full bottles are to be kept on board in a suitably vented locker until a dump station is available to empty them. Please speak to your SC (self-containment) officer for a final say on the matter. 

For details about RV Self-Containment, please refer to the Self-contained Motor Vehicles Legislation Act 2023 and the Plumbers, Gasfitters, and Drainlayers (Self-Contained Vehicles) Regulations 2023

WCTNZ® is the exclusive authorized distributor of Sun-Mar™ composting toilets in New Zealand. All Sun-Mar™ products available through WCTNZ® are guaranteed authentic, include official manufacturer warranties, and come with comprehensive local customer support—making us New Zealand’s trusted source for sustainable, waterless composting toilet solutions.

Copyright © 2025 Waterless Composting Toilets NZ Limited (WCTNZ®). All short and long product descriptions and content are the property of WCTNZ® | Waterless Composting Toilets NZ. All rights reserved.

This content has been reviewed and approved by Dylan Timney, Managing Director of WCTNZ®, who brings over 17 years of composting toilet expertise and 16 years of experience in building and eco-construction in New Zealand.

Last reviewed: June 26, 2025