Thetford Porta Potti 550P MSD

The Thetford Porta Potti 550P MSD is a marine-grade portable toilet engineered for serious boaters who demand reliable onboard sanitation without compromise. Built for both weekend fishing excursions and extended offshore operations, this MSD-equipped model delivers the industry-leading performance Thetford is known for, combined with a refreshed, modern design that improves usability and durability on the water.

Key specifications include a 4.0-gallon fresh-water tank and a waste-water tank sized for extended cruising without frequent pump-outs. The redesigned pump, valve handle, and fill cap are engineered for saltwater environments where corrosion and wear are constant concerns. The standard lid latch prevents accidental opening in rough seas, while the ergonomic carrying handle—refined in this generation—simplifies maintenance and relocation. An improved seat and cover design enhances comfort and hygiene during extended time aboard. The MSD designation indicates Marine Sanitation Device certification, meeting EPA standards for marine waste containment and disposal.

This portable toilet suits any vessel operator seeking dependable onboard facilities—from center console fishing boats and cruising sailboats to live-aboard situations where a reliable head system is essential. Weekend anglers appreciate the compact footprint and ease of use; long-range cruisers value the tank capacity and durability of Thetford's construction. The included deodorant sample provides immediate odor control. Weighing 12 lbs and measuring 16 × 15 × 17 inches, the Porta Potti 550P MSD fits standard marine head compartments while maintaining accessibility for servicing and cleaning.