Dometic 300 Series RV Toilet Seat | 385311931 | Bone | Plastic

Refresh your Dometic 300 Series RV toilet with the Dometic 385311931 Seat and Cover Assembly in bone. This genuine Dometic OEM replacement seat assembly is the straightforward, cost-effective solution for refreshing your existing 300 Series toilet — swapping out a damaged, worn, or yellowed seat with a clean drop-in replacement that includes both the seat and matching cover.

For Dometic 300 Series Toilets

The 385311931 is designed as a replacement seat assembly for Dometic 300 Series RV toilets. Verify your existing toilet model on the manufacturer label before ordering — Dometic makes multiple toilet model families and seat assemblies are not interchangeable across all model lines.

⚠️ Have an Older 300 Series Toilet?

Worth knowing: the Dometic 300 Series is out of production and has been replaced by the Dometic 400 Series. The 385311931 seat fits your existing 300 Series toilet just fine — but if you're ever ready for a full toilet replacement rather than just a seat refresh, the modern successor is the Dometic Complete 410 RV Toilet — the new-generation compact porcelain replacement for 300 Series toilets.

For now, this seat will keep your existing 300 Series in service longer at a budget-friendly price point.

Standard Plastic Construction in Bone

The 385311931 is the basic plastic seat option for the 300 Series:

• Plastic construction — lightweight, durable, easy to clean
• Bone finish — a warm off-white that complements most RV bathroom palettes
• Cost-effective alternative to premium wood or enameled seat options
• Drop-in replacement for the original seat

If you want a premium slow-close enameled wood seat instead, Dometic offers upgraded variants for certain 310/311 models — but for a straightforward basic replacement at a budget-friendly price, this is the right pick.

When to Replace Your Toilet Seat

Common reasons to swap in the 385311931:

• Existing seat is cracked, chipped, or damaged
• Loose, broken, or worn hinges
• Yellowed or stained surface that no longer cleans up
• Cosmetic refresh as part of bathroom updating
• Routine wear after years of daily use

Complete Kit with Hardware

The 385311931 ships as a complete assembly:

• Seat
• Cover (lid)
• 2-piece hardware pack for mounting

No need to source separate hardware — drop in the new assembly and you're done.

Dimensions for Fitment Verification

Before ordering, verify the 385311931 will fit your toilet bowl:

• Seat overall: 16" × 14-9/16" × 3/4"
• Cover overall: 15-1/2" × 13" × 1"

Genuine Dometic OEM Replacement

As a Dometic factory replacement part, the 385311931 is built to original specifications for a precise drop-in fit on compatible 300 Series toilets.

Key Features

• Genuine Dometic OEM seat and cover assembly
• For Dometic 300 Series toilets
• Plastic construction — lightweight and durable
• Bone finish — clean, warm aesthetic
• Complete kit — seat, cover, and 2-piece hardware pack included
• Cost-effective basic replacement option
• Seat dimensions: 16" × 14-9/16" × 3/4"
• Cover dimensions: 15-1/2" × 13" × 1"
• Lightweight: 1.5 lbs

What's Included

• (1) Seat
• (1) Cover (lid)
• (1) 2-Piece Hardware Pack

Specifications

• Brand: Dometic
• Part Number: 385311931
• Type: Replacement Seat and Cover Assembly
• Compatible Models: Dometic 300 Series toilets
• Material: Plastic
• Color: Bone
• Seat Dimensions: 16" × 14-9/16" × 3/4"
• Cover Dimensions: 15-1/2" × 13" × 1"
• Net Weight: 1.5 lbs
• Gross Weight: 2.35 lbs
• Modern Toilet Successor: Dometic Complete 410 (replaces out-of-production 300 Series)