For years, RV owners have had to choose between comfort and fit. If your RV bathroom had limited vertical clearance, a raised floor, or overhead cabinetry, your options for a premium porcelain toilet were often limited.

That's finally changed.

The Dometic 421 Platinum Low Profile RV Toilet has arrived, bringing the same premium features found in the popular 420 Platinum—but in a lower-profile design that's perfect for RVs requiring a shorter seat height. If you've been waiting for a truly premium replacement toilet that fits where others can't, the wait is over.

Why the 421 Platinum Matters

The biggest advantage of the new 421 Platinum is its low-profile design.

While many RV owners prefer residential-height toilets, not every coach or travel trailer has the space to accommodate one. The 421 Platinum was engineered specifically for RVs with:

• Raised bathroom platforms
• Cabinets or countertops above the toilet
• Limited vertical clearance
• Factory-installed low-profile toilets

Instead of forcing owners to compromise with an all-plastic toilet, the 421 Platinum delivers premium porcelain construction while maintaining a comfortable 13-1/2-inch seat height.

Premium Comfort Without Sacrificing Space

The 421 Platinum isn't just shorter—it's loaded with features designed to improve your RV bathroom experience.

Premium Porcelain Bowl

Unlike entry-level plastic toilets, the 421 Platinum features a high-quality porcelain bowl that:

• Resists stains and odors
• Cleans more easily
• Won't discolor over time
• Provides a true residential feel

Residential Elongated Seat

The elongated bowl offers significantly more comfort than traditional round RV toilets, making longer trips much more enjoyable.

Soft-Close Seat

No more slammed toilet lids. The included soft-close seat quietly lowers into place while reducing wear over time.

Hygienic Foot Pedal Flush

The dual-action foot pedal allows you to:

• Press partially to add water to the bowl.
• Press fully to flush.

Hands-free operation makes the system more sanitary and easy to use.

A Better Flush Every Time

One of the standout improvements in the Platinum Series is Dometic's 360° PowerFlush system.

Instead of concentrating water in one area of the bowl, the PowerFlush system distributes water around the entire bowl for a more complete rinse while using minimal water. The result is:

• Cleaner bowl after every flush
• Reduced water usage
• Quieter operation
• Improved odor control thanks to the redesigned flush ball seal and water valve.

Built to Fit More RVs Than Ever Before

Perhaps the most exciting feature of the entire new Dometic 400 Series is its universal replacement capability.

The 421 Platinum was designed with:

• Universal 2-bolt mounting
• Industry-leading 7-5/8-inch minimum rough-in
• Compact rear profile

This allows it to replace many existing Dometic toilets—as well as numerous competitor models—with little or no modification. It's one of the easiest premium RV toilet upgrades available today.

Perfect for Older RV Upgrades

The 421 Platinum is an excellent upgrade if you're replacing older models such as:

• Dometic 300, 301
• Dometic 310, 311
• Dometic 320, 321
• Older Traveler Series toilets
• Many Thetford gravity-flush toilets
• Numerous OEM-installed RV toilets from other manufacturers

Its compact footprint and universal mounting make it one of the most versatile replacement toilets on the market.

Why Choose the 421 Instead of the 420?

Both models share the same premium features:

• Premium porcelain bowl
• Elongated residential seat
• Soft-close lid
• 360° PowerFlush
• Universal 2-bolt installation
• Compact rear profile
• Easy-to-service components

The primary difference is seat height.

Choose the 420 Platinum if you prefer a residential chair-height toilet.

Choose the 421 Platinum if your RV requires a low-profile 13-1/2-inch seat height or has limited vertical clearance.

Available in Bone and White

The Dometic 421 Platinum is available in both Classic White and Bone, making it easy to match virtually any RV interior. Whether your bathroom features modern white finishes or traditional cream-colored fixtures, there's a Platinum model to complement your space.

Now Available at RVToiletParts.com

After months of anticipation, we're excited to offer the all-new Dometic 421 Platinum Low Profile RV Toilet.

If you've been searching for a premium porcelain RV toilet that combines luxurious comfort, a compact design, and universal compatibility, the 421 Platinum is one of the best upgrades you can make to your RV bathroom.

Need help determining if it's the right replacement for your current toilet? Our team specializes exclusively in RV toilets and replacement parts. Contact us—we're happy to help you find the perfect fit.