The Dometic 300 Series is one of the most popular and widely replaced RV toilets on the market, and the 400 BNE is the standard-height, bone white variant with foot-flush operation and a genuine vitreous china bowl. If your current toilet is cracked, stained, or just worn out, this is a direct bolt-down swap onto your existing 3-inch RV floor flange -- no plumbing rework required in most installations.
Most budget RV toilets ship with plastic bowls that stain, scratch, and retain odors over time. The Dometic 300 Series uses a vitreous china bowl -- the same material as residential toilets -- so the surface stays cleaner longer and resists the discoloration that plagues plastic. At 17 lbs, it is still light enough for a solo installer to handle.
The 400 BNE designation breaks down like this: 400 refers to the 300 Series platform (the model family), B indicates the bone white color, N indicates no seat included (seat is sold separately), and E indicates the standard-height base. This is the configuration stocked most often in service bays and RV parts warehouses because it fits the widest range of rigs.
Foot-flush operation keeps your hands free and off the flush mechanism -- useful when wearing gloves, managing kids, or working in a tight bathroom space. A full-press of the foot pedal opens the blade valve for a flush; a partial press fills the bowl with fresh water for pre-rinse or odor control.
Non-porous ceramic surface resists staining and odor absorption that plague plastic bowls. Easier to clean and longer lasting.
Two-stage pedal: partial press fills bowl with water, full press opens blade valve and flushes. Hands-free and intuitive.
Bolts directly onto a standard 3-inch RV floor waste flange. Fits the majority of Class A, Class C, fifth-wheel, and travel trailer installations.
Despite the china bowl, the 300 Series keeps overall weight to 17 lbs -- manageable for one person during installation or replacement.
Dometic's 300 Series toilet family is available in multiple configurations. Understanding the naming convention helps you order the exact part you need:
If your current toilet is a Dometic 310 or 320 Series, note that those use a plastic bowl and a slightly different base profile. The 300 Series is the china-bowl upgrade and is not a drop-in swap for the 310/320 without verifying your flange spacing.
If your existing toilet is a Dometic 300 Series (part numbers in the 9610008xxx range or legacy 302/310 references with the 3-inch flange), the 400 BNE mounts to the same bolt pattern and water supply connection. Most installs take under 30 minutes with basic hand tools.
The 300 Series mounts to your RV floor using a standard closet bolt kit (typically included -- verify at time of purchase) that engages the 3-inch floor flange. Fresh water supply connects via a 3/8-inch compression or push-fit connection at the back of the base, depending on your rig's existing supply line.
The "N" in 400 BNE means no toilet seat is included with this unit. You will need to order a compatible 300 Series seat separately. Dometic part 385320284 (bone) is the standard match for this color. Aftermarket seats sized for the 300 Series bowl also fit.
Bone white (B) is a warm off-white with slight yellow-beige tone. It is different from parchment (P) and from bright white (W). If you are matching an existing bathroom decor or replacing fixtures, confirm your color family before ordering. Colors can look similar in photos but are visibly different side by side.
Complete your installation with these commonly paired items: Dometic 300 Series bone toilet seat (385320284), RV toilet seal lubricant and conditioner, RV-safe toilet treatment tablets or liquid, and a 3/8-inch water supply line if your existing line is worn or corroded.