300 tall toilet — white302300071Dometic 300 Tall RV Toilet Parts & Exploded Diagram
The Dometic 300 Tall Gravity-Flush toilet uses a foot-operated flush, a round seat and a plastic bowl. Its most commonly replaced components include the flush-ball seal, fresh-water valve, vacuum breaker, seat and floor mounting hardware. The numbered factory drawing helps you find the correct part without confusing the 300 with the 301, 310 or 320 series.
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For the full-height 300, Dometic identifies 302300071 in white and 302300073 in bone. Look for the original model identification on the toilet base before selecting a replacement part.
Dometic 300 original exploded parts diagram
The Dometic sanitation parts guide illustrates the tall 300 toilet with 12 numbered positions, including the seat, flush-ball seal, rinse nozzle, pedal cover, water valve, floor seal and optional spray assembly.
Open factory diagram, page 17 (PDF)
View the numbered drawing here
The source contains several Dometic toilet families. Open the PDF directly for easier full-screen viewing on a phone.
Part numbers by diagram position
| No. | Dometic part number | Component |
|---|---|---|
| 1 | 385311930 / 385311931 | Seat and cover, white / bone; includes mounting hardware |
| 2 | 385311658 | Flush-ball seal at the bowl outlet |
| 3 | 385311932 / 385311933 | Bowl rinse-nozzle kit, white / bone |
| 4 | 385311652 / 385311653 | Floor mounting hardware and seal, white / bone; includes position 5 |
| 5 | 385311654 / 385311655 | Floor-bolt caps, white / bone |
| 6 | 385311656 / 385311657 | Foot-pedal cover, white / bone |
| 7 | 385311641 | Water valve kit |
| 8 | Confirm by toilet model | Bowl water-supply hose and clamps; identify the correct hose using the original model and parts-list revision |
| 9 | 385230335 / 385316906 | Vacuum breaker with hand-spray connector / standard vacuum breaker |
| 10 | 385319054 | Optional hand-spray assembly with vacuum breaker |
| 11 | 385311124 | Optional white hand sprayer |
| 12 | 385230319 | Optional hand-sprayer mounting bracket and screws |
Choose the correct repair part
The bowl will not hold water
Examine the bowl outlet and 385311658 flush-ball seal (position 2). A worn or dirty sealing surface can let the water level fall.
The flush water keeps running
Inspect the pedal operation and 385311641 water valve (position 7), along with the supply hose connections.
Water appears near the floor
Check the mounting hardware and floor seal (position 4). These are separate from the bowl's flush-ball seal.
Complete Dometic 300 toilet models
These are the full-height 300 models identified in the original parts guide. Check the base label, colour and installation clearance before replacing the complete toilet.
300 tall toilet — white302300071
300 tall toilet — bone302300073300 versus 310 and 320
The 300 uses a round-seat plastic toilet configuration. The 310 has a ceramic bowl and a different seat; the 320 has a ceramic bowl with an elongated wood seat. Some replacement valves and seals share part numbers, but the seats and other model-specific pieces should not be interchanged by appearance alone.
Compare the Dometic 310 parts diagram or Dometic 320 parts diagram if the installed toilet has a ceramic bowl. Shut off the fresh-water supply before servicing the toilet, and follow the replacement kit's installation instructions.
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 300 parts by photo
Choose a photographed part to open its UsedRVParts listing. Numbers beneath the photographs match the manufacturer drawing further down the page.
Flush-ball seal385311658The replaceable seal at the bowl outlet. Diagram 2.
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Fresh-water valve385311641Opens and closes the incoming flush-water supply. Diagram 7.
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White seat and cover385311930White replacement seat/cover assembly for the 300 toilet. Diagram 1.
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Standard vacuum breaker385316906Vacuum breaker for the version without an optional hand sprayer. Diagram 9.
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White floor mounting hardware385311652White mounting hardware for securing the toilet to its floor connection. Diagram 4.
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Bone floor mounting hardware385311653Bone-coloured mounting-hardware version. Diagram 4.
View this partAdditional parts for toilets with a hand sprayer
These components relate to the optional rinse-sprayer plumbing arrangement. Match the existing hose and vacuum-breaker connection.
Hand-spray vacuum breaker385230335Vacuum breaker used with a separate hand-spray connection. Diagram 9.
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Optional vacuum-breaker spray kit385319054White kit for the optional hand-sprayer plumbing arrangement. Diagram 10.
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Optional toilet hand sprayer385311124Hand-sprayer kit for equipped toilets. Diagram 11.
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