The Dometic 300 is the standard-height, plastic-bowl gravity-flush RV toilet. The manufacturer's exploded parts sheet identifies the seat, flush-ball seal, bowl-rinse nozzle, water valve and floor-mount hardware separately so you can find the component you need without replacing the entire toilet.
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 | 385311930 | White seat and cover assembly | |
| 1 | 385311931 | Bone seat and cover assembly | |
| 2 | 385311658 | Flush-ball seal | |
| 3 | 385311932 | White bowl-wash spray nozzle kit | |
| 3 | 385311933 | Bone bowl-wash spray nozzle kit | |
| 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 pedal cover | |
| 6 | 385311657 | Bone pedal cover | |
| 7 | 385311641 | Water valve kit | |
| 8 | 385340177 | White water supply hose | |
| 8 | 385345377 | Bone water supply hose | |
| 9 | 385230335 | Vacuum breaker for optional hand-spray configuration | View product |
| 9 | 385316906 | Vacuum breaker for toilets without hand spray | View product |
| 10* | 385319054 | White hand-spray and vacuum-breaker kit | View product |
| 11* | 385311124 | White hand sprayer kit | View product |
| 12* | 385230319 | Hand-spray mounting bracket with screws |
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
Make sure the toilet is the tall Dometic 300, not the low-profile 301 or the ceramic-bowl 310. The white and bone versions use different cosmetic parts. When replacing a bowl seal, use the flush-ball seal reference rather than the floor-flange seal included with the mounting kit.
The factory parts drawing gives 385311930 for the white seat and cover. Because seats can differ by toilet and production version, compare the installed hinge arrangement and complete kit description before ordering; the diagram entry is provided for identification without a direct purchase link.
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.
