Low Profile RV Toilets

What is a low profile RV toilet and how is it different from a standard model?

A low profile RV toilet sits roughly 13 to 15 inches tall at the bowl rim, compared to 17 to 18 inches on a standard-height unit. The shorter footprint clears tight bathroom enclosures, fits under angled walls, and works well in travel trailers and Class B vans where vertical space is limited. Function is identical to a full-height model: foot pedal flush, gravity discharge into the black water tank, and a standard 3-inch waste flange connection.

What are the typical dimensions of a Dometic 321 low profile RV toilet?

The Dometic 321 measures approximately 13.75 inches tall, 15 inches wide, and 18.5 inches deep, with a 3-inch floor flange centered about 5.75 inches from the back wall. Always measure your existing rough-in and flange location before ordering, since clearance to the side wall and door swing varies by floorplan. Confirm your current model number against the replacement spec sheet to avoid mounting hole or water inlet mismatches.

Will a low profile toilet fit my existing RV plumbing?

In most cases, yes. RV toilets use a standard 3-inch waste flange and a 1/2-inch cold water inlet at the back or side, which matches what almost every gravity-flush low profile model expects. The two things to verify are water inlet position (left rear vs. right rear) and floor bolt spacing. If you are also refreshing the wax-free seal or floor flange, check the RV winterizing kits for off-season prep supplies you may want to pick up at the same time.

How do I replace a low profile RV toilet myself?

Shut off the water pump and city water supply, flush the bowl to drain residual water, then disconnect the cold water line at the back of the toilet. Remove the two floor bolts at the base, lift the old unit straight up, and inspect the floor flange and seal. Set the new toilet over the flange, hand-tighten the bolts in an alternating pattern, reconnect the water line, and test for leaks at low and high pressure. The whole job typically takes 30 to 45 minutes with basic hand tools.

What other RV bathroom and plumbing parts pair well with a new toilet?

When you are already under the bathroom, it is worth checking your water heater anode rod, fresh water fittings, and roof vent condition. Owners replacing a toilet often pick up a matching fill valve or floor seal kit at the same time. If your water heater is due for service, our 10 gallon RV water heater collection covers Suburban and Atwood replacements, and the Ventline vent essential accessories page has the bath fan parts most commonly replaced alongside a toilet swap.

Are low profile RV toilets made of plastic or ceramic?

Both are available in this collection. Plastic models (polypropylene bowl and lid) weigh 8 to 12 pounds, resist chips, and cost less, making them common in travel trailers and lightweight fifth wheels. Ceramic or porcelain models weigh 25 to 35 pounds, clean more easily, and resist staining from black tank chemicals, which is why they are standard in many Class A motorhomes. Choose based on rig weight tolerance and how often you use the bathroom.

Do these toilets ship with all the hardware needed for installation?

Each low profile RV toilet ships with floor bolts, a closet flange seal, and the water inlet fitting required for a direct replacement on most rigs. If your existing floor flange is cracked or your supply line is brittle, plan to source those separately before installation day. Need help confirming what is in the box for a specific model? Our team at United RV Parts is here to help, text or call 817-984-1852.