Know Thy Throne: Dometic 300, 310 & 320 RV Toilet Parts Diagrams 

Let’s be honest—nothing ruins a perfect camping trip faster than a toilet that refuses to cooperate. When your RV throne rebels, it’s not the time for panic… it’s the time for parts diagrams.

Whether your pedal is floppy, your bowl won’t hold water, or your flush sounds like it’s coughing up a lung, knowing exactly what part you need can save you time, money, and a whole lot of frustration.

Today, we’re breaking down the most popular RV toilet lineup from Dometic:

• The rugged 300 series
• The upgraded 310 series
• The king of the campground, the 320 series

Let’s pop the lid (figuratively) and dig in.

Dometic® 300 Series (300 standard height, 301 low profile) 

The Dometic 300 RV Toilet is one of the most widely installed RV toilets in North America—and for good reason. It’s durable, lightweight, and easy to service. Translation: when something breaks, you’re not doomed.

Most Common Dometic 300 Replacement Parts:

• Water valve (for weak or no flush)
• Flush pedal & linkage
• Bowl seal (aka the “stop the stink” gasket)
• Ball shaft & spring kit
• Foot pedal spring

Pro Tip:
If your Dometic 300 won’t hold water in the bowl, odds are it’s the bowl seal, not the valve. That’s one of the most commonly misdiagnosed repairs.

Dometic® 310 Series (310 Standard Height, 311 Low Profile)

The Dometic 310 RV Toilet is the popular “comfort upgrade” over the 300. Taller height, ceramic bowl, smoother pedal action—and yes, slightly different internals.

Common 310 Series Failure Points:

• Water module & valve assembly
• Pedal return spring
• Bowl seal and ball assembly
• Pedal linkage rods

Important Note:
While many 300 and 310 parts look similar, they are not always interchangeable. This is exactly why using proper parts diagrams matters—you don’t want to play “RV toilet roulette.”

Dometic® 320 Series (320 Standard Height, 321 Low Profile)

The Dometic 320 RV Toilet is the king of RV porcelain. Full residential height, high-profile design, powerful gravity flush—this is the toilet for RVers who refuse to “rough it” in the bathroom.

Popular Dometic 320 Replacement Parts:

• High-flow water valve
• Foot pedal assembly
• Bowl seal & blade kit
• Mounting hardware & floor seal
• Spring and linkage kits

Good to Know:
The 320’s water valve delivers more flow than the 300/310—so using the wrong valve can lead to weak flushing or leaks.

Why Using the Correct Parts Diagram Actually Saves You Money

Guessing at RV toilet parts leads to:

• Ordering the wrong part
• Waiting for returns
• Paying shipping twice
• Still having a broken toilet

Using model-specific exploded diagrams lets you:
Identify the exact OEM replacement
Avoid incompatible aftermarket parts
Fix the problem correctly the first time
Get back to camping faster

(Your family will thank you.)

Find the Exact Dometic 300, 310 & 320 Parts—Without the Headache

At rvtoiletparts.com, we stock:

• OEM replacement parts
• Model-specific components
• Discontinued hard-to-find parts
• Complete valve, pedal, seal, and hardware kits

We built our store for RV owners who don’t want guesswork, Amazon knockoffs, or shady compatibility charts—just the right part, the first time.

Need Help Finding the Right Part?

If you’re not 100% sure which part you need:

• Check your model number
• Use the diagrams above
• Or reach out to our team at rvtoiletparts.com—we’ll help you match it perfectly.