* Advanced Flush & Hygiene System: Utilizes a user-friendly lever and spiral flush for thorough cleaning. The system includes a sealing valve to lock odors, a pre-pressure release to prevent splashback, and an internal pressure balance valve to protect tank integrity.
Source: https://www.netebath.com/portable-toilet-leak-proof-handle-pump-rotating-spout-camping-boating-hiking-trips-removable-and-washable-outdoor-toilet.html