Nomad Gear Finder
Thetford Porta Potti 550P MSD Portable Toilet (92856)
$199.95 as of – Details
Only 1 left in stock - order soon on Amazon
- Reviews
- Mostly positive
- Brand
- Thetford
Reviews from owners
Mostly positive Boaters who own the 550P MSD generally like it, praising the roomy tank, tool-free emptying and trouble-free use over several years. The recurring complaint is the weak stock hold-down bracket, which flexes or lets the unit shift in rough water, so several owners reinforced or replaced it. Weight when full and a leaky level gauge were also mentioned.
Review sources (2)
Owners like
- Large tank gives about four days for two people
- Easy to remove and empty without tools
- Trouble-free for years in several owners' experience
Owners dislike
- Stock hold-down bracket weak and flexes
- Unit can shift or roll in rough water
- Heavy when full
About this summary
Text in this section is an AI summary of reviews we found for this product by searching multiple forums and merchant sites, Reddit, Facebook, and videos. We try to exclude reviews that are obviously sponsored or biased. No reviews from Amazon are used due to Amazon rules; see our About page for more information on how we gather and use opinions and reviews from other sites. For some products, there may not be enough reviews to give an accurate assessment of sentiment, so check the Sources to confirm.
Specifications
These details are subject to change and may not be current. Please check Amazon or manufacturer web site to confirm before purchase; see our About page for more information.
- Popular brand
- Yes
Features
Details from the Thetford Amazon listing:
- Fresh water tank capacity - 4.0 gallons
- Package Weight : 10.55 lbs.
- Type - Piston MSD with Hold Down Kit. Removable seat and cover for easy cleaning.
- Package Dimensions: 16.5 H x 16.5 W x 15 D (inches)
Similar products from other brands
Chosen for their similar specs and price:
 This productThetford Porta Potti 550P MSD Portable Toilet (92856) |
 Porta Potti 92306 White Thetford Corp, Polypropylene |
 Dometic 972 |
 TRELINO T1-01002 |
|
|---|---|---|---|---|
| Price | $199.95 | $179.90 | $151.33 | $319.00 |
| Reviews | Mostly positive | – | – | – |
| Model | – | – | 972 | T1-01002 |
| Popular brand | Yes | Yes | Yes | Yes |
| Toilet type | – | – | Cassette (flushing, sealed holding tank) | Urine-diverting composting (dry separating) |
| Flush type | – | – | Push button, hand air pump | – |
| Uses before emptying | – | – | – | Urine canister 9-11 No. 1s; solids container 6-8 No. 2s |
| Waste tank / solids bin gal | – | – | 2.6 | 1.7 |
| Waste tank / solids bin (L) L | – | – | 9.8 | 6.5 |
| Urine container gal | – | – | – | 1.19 |
| Urine container (L) L | – | – | – | 4.50 |
| Ventilation fan | – | – | – | No |
| Waste level indicator | – | – | Yes | – |
| Power sources | – | – | None (no electronics) | None (no electronics) |
| Rotating pour-out spout | – | – | Yes | – |
| Floor mounting kit | – | – | No | – |
| Consumables required | – | – | Holding tank deodorant (and toilet paper) | Waste bags for the solids bin, litter, replacement lid membrane every 2-3 months |
| Seat height in. | – | – | 12.5 | – |
| Seat height (mm) mm | – | – | 318 | – |
| Max user weight lbs | – | – | – | 331 |
| Max user weight (kg) kg | – | – | – | 150 |
| Weight lbs | – | – | 12.00 | 8.60 |
| Weight kg | – | – | 5.44 | 3.90 |
| Length in. | – | – | 15.25 | 15.35 |
| Length mm | – | – | 387 | 390 |
| Width in. | – | – | 13.12 | 12.99 |
| Width mm | – | – | 333 | 330 |
| Depth/Height in. | – | – | 12.50 | 11.65 |
| Depth/Height mm | – | – | 318 | 296 |
| Housing material | – | – | ABS | ABS body, PP containers |
| Warranty | – | – | 1 Year | 2 Years |
Prices from Amazon as of . Product prices and availability are accurate as of the date and time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of the product. As an Amazon Associate I earn from qualifying purchases.
Specifications last updated Nov 10, 2026.