Dometic 320 — bone302320083Dometic 320 RV Toilet Parts & Exploded Diagram
The Dometic 320 is a full-height, foot-flush RV toilet with an elongated vitreous ceramic bowl and an enameled wood seat. Its flush-ball seal, water valve, vacuum breaker and floor mounting hardware are identified separately on the numbered parts diagram. Match the model number on your toilet and use the callout numbers below to choose the correct replacement.
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Dometic 320 exploded parts diagram
The original Dometic 320 parts drawing uses positions 1 through 13. It includes the seat and its fasteners, flush-ball seal, floor hardware, pedal cover, water valve, supply hose, vacuum breaker and optional hand sprayer.
Open original 320 diagram — page 22 (PDF)
View the factory drawing on this page
This drawing is within Dometic's larger sanitation parts PDF. The link above is better for full-screen zoom on a phone.
Replacement part numbers by diagram position
| No. | Dometic part number | Component |
|---|---|---|
| 1 | 385311861 | Seat and cover mounting hardware |
| 2 | 385311863 / 385311864 | Wood seat and cover — white / bone; includes item 1 |
| 3 | 385311658 | Flush-ball seal |
| 4 | 385311652 / 385311653 | Mounting hardware and floor seal — white / bone; factory drawing includes item 5 |
| 5 | 385311654 / 385311655 | Floor mounting bolt caps — white / bone |
| 6 | 385311656 / 385311657 | Foot-pedal cover — white / bone |
| 7 | 385311641 | Water valve kit |
| 8 | 385340177 / 385345377 | Water supply hose — white / bone |
| 9 | 385311164 | ½-inch sealing grommet |
| 10 | 385230335 / 385316906 | Vacuum breaker with hand-spray connection / standard vacuum breaker; includes item 9 |
| 11 | 385319054 | Optional white hand-spray kit with vacuum breaker; factory list includes items 9, 10 and 12 |
| 12 | 385311124 | Optional white hand sprayer; factory list includes item 13 |
| 13 | 385230319 | Optional hand-sprayer mounting bracket and screws |
320 versus 310: which seat fits?
The 320 uses an elongated enameled wood seat. Its Dometic seat-and-cover part numbers are 385311863 (white) and 385311864 (bone), shown at diagram 2. The 310 series uses a different polypropylene seat assembly; its seat part numbers should not be substituted for the 320 solely because both toilets share some seals and valves.
The factory 320 seat-and-cover numbers are shown in the parts table for identification. For replacement mounting hardware, the 320 drawing lists 385311861 at position 1.
Choose the right seal, valve or vacuum breaker
Water drains from the bowl
Inspect the 385311658 flush-ball seal (3) and the sealing surface at the bowl outlet.
Fresh water continues running
Inspect the 385311641 water valve (7), pedal return and hose connections.
Leak at the floor connection
Check the flange seal and mounting hardware (4–5). These are different from the flush-ball seal inside the bowl.
Confirm the model before ordering
The standard-height 320 is approximately 19¾ inches high, 14¾ inches wide and 22 inches deep, with an 18¼-inch seat height. Dometic specifies an 11-inch minimum rough-in from the back wall to the floor-flange centre. The low-profile 321 is a separate model and has different dimensions.
The toilet identification label is located on the base below the water valve. When servicing the flush mechanism, turn off the water supply and follow Dometic's installation and operation manual (PDF).
Complete Dometic 320 toilet — bone
Dometic 320 — bone302320083For the smaller-footprint model, use the Dometic 310 parts diagram to compare its seat and mounting arrangement. Do not assume a component fits both versions unless its exact manufacturer number appears on the relevant parts list.
Compare Dometic 300, 310 and 320 toilets by photo and dimensions to check bowl material, seat shape and installation clearances before choosing parts.
Find Dometic 320 parts by photo
Each pictured part links to its listing on UsedRVParts.ca. Diagram numbers refer to Dometic's original 320 gravity-flush parts drawing.
Flush-ball seal385311658Rubber seal at the flush-ball opening. A starting point when bowl water slowly disappears. Diagram 3.
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Water valve kit385311641Controls the incoming rinse water when the foot pedal is operated. Diagram 7.
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Standard vacuum breaker385316906Vacuum breaker for the standard arrangement without a hand sprayer. Diagram 10.
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Floor mounting hardware — white385311652The white floor-mounting hardware part number on the factory drawing. Diagram 4.
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Floor mounting hardware — bone385311653Bone-coloured counterpart to the white floor-mounting hardware. Diagram 4.
View partMore pictured parts: optional hand-spray components
These are for the corresponding spray-equipped configuration, not the standard no-sprayer arrangement.
Hand-spray vacuum breaker385230335Different vacuum breaker connection for toilets equipped with a hand sprayer. Diagram 10.
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Optional hand sprayer385311124White hand sprayer identified separately in the optional spray arrangement. Diagram 12.
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