Dometic 321 — white302321681Dometic 321 Low-Profile RV Toilet Parts & Diagram
The Dometic 321 is a low-profile, foot-flush RV toilet with an elongated ceramic bowl and an enameled-wood seat. Its bowl seal, fresh-water valve, vacuum breaker and floor-mounting hardware can be identified from the factory's numbered parts drawing. Use the diagram and the part number on your original component to select a replacement.
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The 321 is the shorter counterpart of the 320. It has a 13½-inch seat height and is designed for installations with a raised platform or limited vertical clearance. Seat assemblies differ from the 310 and 311 series.
Dometic 321 and 321S exploded parts diagram
The factory 321/321S parts drawing identifies 11 numbered component positions. The illustrated seat hardware is separate from the flush-ball seal, and the hand sprayer at positions 10–11 is optional.
Open Dometic 321/321S factory diagram (PDF)
View the original exploded drawing here
The Dometic-authored guide covers numerous toilet models. For a larger view, open the PDF and navigate to the 321/321S drawing on the printed page numbered 60.
Factory part numbers by diagram position
| No. | Dometic part number | Component |
|---|---|---|
| 1 | 385311650 / 385311651 | Seat mounting hardware, white / bone |
| 2 | 385311863 / 385311864 | Enameled-wood seat and cover, white / bone; includes item 1 |
| 3 | 385311658 | Flush-ball seal |
| 4 | 385311652 / 385311653 | Floor mounting hardware and seal, white / bone; includes item 5 |
| 5 | 385311654 / 385311655 | Floor mounting bolt caps, white / bone |
| 6 | 385311641 | Fresh-water valve kit |
| 7 | 385311937 | Bowl rinse-water supply hose with mounting clamps |
| 8 | 385311164 | Half-inch water-connection sealing grommet |
| 9 | 385230335 | Vacuum breaker for optional hand sprayer; includes item 8 |
| 10 | 385311124 | Optional white hand sprayer with bracket |
| 11 | 385319054 | Optional white hand-spray kit with vacuum breaker; includes items 8, 9 and 10 |
Which repair part should you check?
Bowl will not hold standing water
Look at the flush ball and the 385311658 seal (item 3). Clean the sealing surface before deciding whether the seal needs replacement.
Water keeps running into the bowl
Check pedal return, the supply connection and the 385311641 water valve (item 6).
Water leaks at the floor
Check the floor connection and mounting/seal kit (item 4), which is different from the flush-ball seal.
Confirm your toilet and installation space
The manufacturer's dimensional manual lists the 321 at 15 inches overall height, 14¾ inches wide and 22 inches deep, with a 13½-inch seat height. The minimum rough-in is 11 inches from the wall to the floor-flange centre. Verify clearances behind the bowl and around the foot pedal before selecting a replacement toilet.
View Dometic's gravity-flush installation and maintenance manual (PDF) for the water connection, winterization and safe repair procedures. Shut off the water supply before servicing the valve. Do not separate the ceramic bowl from the factory-sealed plastic base for routine maintenance.
Complete white Dometic 321 toilet
Dometic 321 — white302321681If you have the taller elongated-bowl model, see the Dometic 320 parts diagram. For a lower-profile round-bowl ceramic toilet, compare the Dometic 311 parts guide. Match model labels and exact part numbers before assuming compatibility between series.
Compare the Dometic 301, 311 and 321 low-profile toilets to identify the correct model, dimensions and factory parts guide.
Find Dometic 321 replacement parts by photo
Each photograph opens its corresponding UsedRVParts.ca listing. The diagram numbers are from Dometic's 321/321S low-profile exploded view.
Flush-ball seal385311658Seal at the bowl outlet when the flush ball closes. Drawing 3.
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Fresh-water valve385311641Controls incoming rinse water when the foot pedal is operated. Drawing 6.
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White floor mounting kit385311652White floor mounting hardware and floor seal. Drawing 4.
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Bone floor mounting kit385311653Bone-coloured floor mounting hardware and floor seal. Drawing 4.
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White seat mounting hardware385311650Mounting hardware for the white 321 wood-seat arrangement. Drawing 1.
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Vacuum breaker for hand spray385230335Vacuum breaker for the optional hand-spray connection. Drawing 9.
View this partMore photographed parts: standard vacuum breaker and optional hand sprayer
The standard water connection and the hand-spray connection use different vacuum-breaker fittings. Compare your existing arrangement before choosing either part.
Standard vacuum breaker385316906Standard no-hand-sprayer arrangement; listed on Dometic's related gravity-flush service information.
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Optional white hand sprayer385311124Hand sprayer assembly for toilets equipped with a rinse sprayer. Drawing 10.
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Hand-spray vacuum-breaker kit385319054White optional kit combining the hand-spray plumbing components. Drawing 11.
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