Flush-ball seal385311658Seals the bowl outlet when the flush ball closes. Diagram 4.
View this partDometic 311 Low-Profile RV Toilet Parts & Exploded Diagram
The Dometic 311 low-profile RV toilet has a ceramic bowl, foot-pedal flush and a compact base. Its bowl seal, fresh-water valve, vacuum breaker, seat and floor-mounting components can be identified separately using the numbered Dometic exploded drawing below.
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The diagram on this page shows the 311 plastic-seat configuration. Dometic also supplied wood-seat and slow-close seat versions; those use different seat components. Before replacing a seat or cover, check the exact toilet and existing seat arrangement rather than relying on the 311 model name alone.
Dometic 311 exploded parts diagram
Use the red callout numbers on the original drawing to identify each component. The one-page PDF is convenient for enlarging the diagram on a phone. The complete Dometic sanitation guide also contains the 311 breakdown on page 21.
Open the one-page 311 parts diagram (PDF)
View the exploded drawing here
For the full manufacturer reference, open Dometic's sanitation parts guide (PDF).
Factory part numbers by diagram position
| No. | Dometic part number | Component |
|---|---|---|
| 1 | 385311648 / 385311649 | Seat and cover mounting brackets — white / bone |
| 2 | 385311650 / 385311651 | Seat mounting hardware — white / bone; includes item 1 |
| 3 | 385311646 / 385311647 | Replacement plastic seat and cover — white / bone; includes items 1 and 2 |
| 4 | 385311658 | Flush-ball seal |
| 5 | 385311652 / 385311653 | Floor mounting hardware and seal — white / bone; includes item 6 |
| 6 | 385311654 / 385311655 | Floor mounting bolt cap — white / bone |
| 7 | 385311641 | Fresh-water valve kit |
| 8 | 385311937 / 385311938 | Water supply hose — white / bone; supplied with clamps |
| 9 | 385311164 | Half-inch sealing grommet |
| 10 | 385230335 / 385316906 | Vacuum breaker with hand-sprayer connection / standard vacuum breaker; includes item 9 |
| 11 | 385319054 | Optional white hand-spray kit with vacuum breaker; includes items 9, 10 and 12 |
| 12 | 385311124 | Optional white hand sprayer; includes item 13 |
| 13 | 385230319 | Optional white hand-sprayer bracket and screws |
Common repair questions
Why does the bowl lose standing water?
Inspect the flush-ball surface and 385311658 seal (diagram 4). The bowl seal is different from the floor seal.
What if the incoming water keeps running?
Check the foot pedal's return and the 385311641 water valve (diagram 7), then inspect the supply hose and connections.
Seat choices for the 311
The factory drawing above identifies 385311646 white and 385311647 bone plastic seat-and-cover kits (diagram 3). It also identifies their related mounting brackets and fasteners at positions 1–2. These numbers are for the plastic-seat version in that drawing. If the installed 311 has a wooden or slow-close seat, match the original seat and hinge assembly to its own part number before purchasing.
Other Dometic gravity-flush parts guides
For a high-profile ceramic-bowl model, see the Dometic 310 toilet parts guide. For a low-profile plastic toilet, compare the Dometic 301. The Dometic 320 uses a different bowl and seat arrangement. Turn off the fresh-water supply before servicing the toilet.
Compare the Dometic 301, 311 and 321 low-profile toilets to identify the correct model, dimensions and factory parts guide.
Dometic 311 replacement parts by photo
These pictured components link directly to UsedRVParts.ca product listings. Each part includes the callout number from the factory diagram.
Flush-ball seal385311658
Fresh-water valve385311641Regulates incoming water when the foot pedal is operated. Diagram 7.
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Standard vacuum breaker385316906For the standard water connection without a hand sprayer. Diagram 10.
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White plastic seat and cover385311646White seat assembly for the plastic-seat arrangement illustrated. Diagram 3.
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Bone plastic seat and cover385311647Bone-coloured seat assembly for the illustrated configuration. Diagram 3.
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White floor mounting kit385311652Mounting hardware and seal for the floor connection, white trim. Diagram 5.
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Bone floor mounting kit385311653Matching floor mounting hardware and seal with bone trim. Diagram 5.
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White seat mounting hardware385311650White seat hardware that includes the mounting brackets shown as item 1. Diagram 2.
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Hand-sprayer vacuum breaker385230335For the hand-sprayer water connection; not the standard version. Diagram 10.
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Optional sprayer and breaker kit385319054Factory-listed white accessory kit with vacuum-breaker plumbing. Diagram 11.
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Optional white hand sprayer385311124Handheld rinse-sprayer assembly for toilets equipped with this option. Diagram 12.
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