The Dometic 320 gravity-flush toilet has a ceramic bowl and a longer, elongated seat than the 310 series. Its manufacturer's exploded view identifies the seat hardware, flush-ball seal, water valve, hose, pedal cover and optional hand sprayer, with original part numbers listed beside the drawing.
Manufacturer exploded parts diagram
Match a numbered callout on the original drawing to the matching entry below. Open the full document to enlarge small parts and connections.
The full PDF lets you zoom in on the parts and reference numbers.
Open the original manufacturer's illustrated reference (PDF)
Parts by exploded-view callout
Use the exact manufacturer number and description to identify the replacement. Only the entries linked to the existing NewRVParts listings are shown with purchase links.
| Callout | Manufacturer no. | Component | Available product |
|---|---|---|---|
| 1 | 385311861 | Seat and cover mounting hardware | |
| 2 | 385311863 | White elongated seat and cover kit | |
| 2 | 385311864 | Bone elongated seat and cover kit | |
| 3 | 385311658 | Flush-ball seal | |
| 4 | 385311652 | White mounting hardware and floor-seal kit | View product |
| 4 | 385311653 | Bone mounting hardware and floor-seal kit | View product |
| 5 | 385311654 | White floor-bolt cap | |
| 5 | 385311655 | Bone floor-bolt cap | |
| 6 | 385311656 | White foot-pedal cover | |
| 6 | 385311657 | Bone foot-pedal cover | |
| 7 | 385311641 | Water valve kit | |
| 8 | 385340177 | White supply hose | |
| 8 | 385345377 | Bone supply hose | |
| 9 | 385311164 | Half-inch sealing grommet | |
| 10 | 385230335 | Vacuum breaker for sprayer configuration | View product |
| 10 | 385316906 | Vacuum breaker without hand sprayer | View product |
| 11* | 385319054 | White spray kit with vacuum breaker | View product |
| 12* | 385311124 | White hand sprayer with bracket | View product |
| 13* | 385230319 | Hand-spray mounting bracket and fasteners |
Photos of relevant NewRVParts products
These are photographs from the linked NewRVParts listings. They help you recognize the part or complete model; confirm the manufacturer number and kit details on the individual product page.
Confirm the correct component
The 320's seat uses its own 385311863 white or 385311864 bone replacement number. Do not substitute a 310 plastic seat based on its similar appearance. Compare the installed toilet's model label and available space before replacing the seat or the whole unit.
Dometic lists the flush-ball seal and water valve as separate repair parts. When replacing the toilet, the mounting hardware-and-seal kit is a floor attachment component—not the ring that seals water in the bowl. Optional hand-spray items are not included with every toilet.
Parts pictured in this guide
Select an image for product details, or view the diagrams and parts lists. Match the complete model and part number before ordering.
