The Porta Potti 135 is a compact portable toilet with a hand-operated bellows flush and a detachable waste tank. The exploded drawing identifies the pump, water-fill cap, waste-tank lip seal and pour-out hardware by original Thetford part number. The same factory parts sheet also covers the 135 Marine and older 155/155SL models.
Repair parts and model photographs
These NewRVParts listings show the bellows pump and lip seal as individual repair parts. The complete standard and marine toilets are shown separately for model identification.
Thetford 0786262 Bellows Flush PumpOriginal callout 2 · replaces pump number 07862
Thetford 07101 Waste-Tank Lip SealOriginal callout 8 · seal around the waste-blade opening
Thetford 92860 Porta Potti 135Complete standard portable toilet, not a replacement component
Thetford 92861 Porta Potti 135 MarineMarine configuration listing · compare mounting and product details
Thetford Porta Potti 135 exploded parts diagram
Use the callouts on Thetford's November 4, 2025 parts drawing to match a component to its original reference below. The image covers the post-2006 Porta Potti 135/135 Marine and pre-2006 155/155SL families.
Original parts and callout numbers
Find the drawing number in the first column. Thetford's updated part numbers replace earlier numbers where indicated; the availability markings refer to original factory parts.
| Callout | Thetford part no. | Part or assembly |
|---|---|---|
| 1 | Not listed | Seat and cover assembly; listed as unavailable |
| 2 | 0786262 | Manual bellows flush pump; supersedes 07862 — view matching part |
| 2 | 07024 | Water inlet tube listed with pump assembly |
| 3 | 35804* | No-spill fresh-water fill cap; limited manufacturer availability |
| 4 | Not listed | Automatic locking latch assembly; listed as unavailable |
| 5 | 0749262 | Pour-out spout; supersedes 07492 |
| 6 | 0749362 | Pour-out spout cap; supersedes 07493 |
| 7 | 35800 | Marine hold-down brackets; shown for marine installations, listed as unavailable |
| 8 | 07101 | Rubber lip seal for the waste-tank opening — view matching part |
| Not shown | 29311 | Flush tube; listed as unavailable |
Identify the correct toilet and repair part
For a weak or non-working hand flush, compare the existing bellows with part 0786262. The 07101 lip seal fits around the lower waste-tank blade opening; it is not the pour-out spout or its cap. These two repair components have separate NewRVParts listings above.
Check the model label on the upper surface of the separated lower waste-tank section. Thetford identifies standard 135 part 92860; marine configurations can use different mounting hardware. The original marine hold-down brackets shown as callout 7 are not included with every toilet.