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IF SERVICE OF THIS TOILET IS EVER REQUIRED, 
READ THIS BEFORE SERVICING PRODUCT.

DO NOT REMOVE TOILET FROM VEHICLE. 
DO NOT SEPARATE CERAMIC BOWL FROM PLASTIC BASE. 
DO NOT REMOVE FOOT PEDAL FROM BASE. 
DISASSEMBLY OF COMPONENTS MAY VOID WARRANTY. 
SEE MANUAL AND REPLACEMENT KITS FOR SERVICE INFORMATION.

Dometic Corporation 

Sanitation Division 

Call Customer Service: 1-800-321-9886 (8 a.m. – 5 p.m. ET)

STOP

TOILET DOES NOT NEED TO BE REMOVED FROM VEHICLE FOR BASIC REPAIRS  

(if necessary)

  

Flush ball seal

 – Dometic’s  

revolutionary ball seal allows future  
replacement of worn or damaged 
ball seals without requiring tools or 
toilet disassembly.  The ball seal can 
be changed in just a few minutes 
without removing the toilet from the 
floor.  Detailed replacement instruc-
tions are included with replacement 
ball seal kits.

Snap-in water valve cartridge

 – 

Allows easy replacement of worn 
or damaged water valves. In cold 
climates, be sure to follow winter-
izing procedure in owner’s manual 
to help avoid water valve failure.  
Refer to replacement instructions 
in new water valve kit prior to  
removal or installation of water 
valve assembly.

Factory-sealed bowl-to-base  
assembly – 

Unlike other Dometic 

foot-pedal toilets, 

the bowl and 

base of 300, 310, and 320 series 
toilets should not be separated for 
any reason

Each Dometic toilet is 100% factory-tested to assure a watertight seal in the toilet bowl before it 
is shipped.

After installation at the RV or other vehicle factory, the entire toilet and waste tank system is flood- 
tested for leaks by filling the system with water to the rim of the toilet bowl. This process requires  
holding the flush ball open with a device which may temporarily distort the ball seal from its original 
shape and, as a result, cause the seal to leak water into the waste tank during normal use. The ball seal 
may need to be reconditioned to its original shape. 

IF NEW TOILET DOES NOT HOLD WATER IN BOWL…

Please follow the procedures below before attempting to replace the seal.

1.  Hold flush ball in full open position by pressing on 

pedal.

2.  Using finger, apply moderate downward pressure 

around edge of ball seal.

3.  Close flush ball. 
4.  Keeping flush ball closed, pour one quart of  

hot tap water into toilet bowl.

5.  Let water cool completely.
6.  Check for leak. 

If leak still persists, flush ball seal should be  
replaced. Follow instructions provided with  
replacement seal kit.

Notes on using the manual 

 

Caution! 

Safety Instruction: Failure to observe this instruction can cause material damage and impair 
the function of the device.

Note

 

Supplementary information for operating the device.

fig. 

1

 A : This refers to an element in an illustration.  In this example, item A in figure 1.

General safety instructions

The manufacturer will not be held liable for claims for damage resulting from the following:
•  Faulty installation or connection
•  Damage to the unit from mechanical influences, misuse or abuse
•  Alterations to the unit without express written permission from the manufacturer
•  Use for purposes other than those described in this manual

Warnings

The following statements must be read and understood before installing, servicing and/or  
operating this product. Modification of this product may result in property damage.
1.  Do not use chlorine or caustic chemicals, such as laundry bleach or drain-opening types, in 

the system. These products damage the seals in toilets and other plumbing valves.

2.  Do not permit foreign objects (paper towels, paper cups, diapers, sanitary napkins, etc.) to be 

flushed through the toilet.

3.  Mechanical seal toilets are designed to only discharge directly into a holding tank. Horizontal 

pipe runs as found in conventional residential or commercial plumbing systems cannot be  
accommodated.

4.  Toilet bowl must be regularly cleaned and winterized according to “Cleaning” and “Winteriza-

tion and storage” procedures in this manual, or your warranty coverage may be voided. 

Intended use

Dometic 300, 310 and 320 series toilets provide lightweight, residential-size toilets for installation 
directly above a holding tank.

Benefits

PowerFlush technology.

  Improved pressurized rim flow creates high-speed vortex of water for full 

bowl rinsing.

Premium user comfort.

  Full-size seat and deep bowl result in greater homelike performance. 

Easy installation.  

Two-bolt design fits most existing toilet floor flanges – great for new or replace-

ment installations. Just place on floor flange, tighten bolts, connect water, and it’s ready.

Ergonomically enhanced pedal operation.  

Lower pedal height for easier use; “one-direction” 

action to add water and flush.

Cu

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Telephone:

 

1-800-321-9886  

U.S.A. and Canada 

  330-439-5550 

 

International

Fax: 

 

330-496-3097  

U.S.A. and Canada 

  330-439-5567 

 

International

Websites:

  

http://www.Dometic.com

                                                                                                                         

 

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TH

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.

1C. If this pr

oduct is placed in commercial or business use, it will be warranted, to the Original Pur

chaser only, to 

be free of defects in material and workmanship for a period of 90 days fr

om the date of purchase.

1D

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mm

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all a

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1-8

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21-

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8 a.m

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d pro

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Sel

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(se

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(b

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f pro

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efu

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er 

th

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arr

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nd a

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th

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. Sel

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rep

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du

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icl

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eq

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2. 

TH

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TH

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Y PE

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ON O

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MP

AN

Y TO C

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WA

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3. 

RE

PA

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OD

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IN

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AS

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’S S

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ME

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ND

ER T

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IN N

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EN

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4. 

SE

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RR

AN

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TH

ER 

 

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PR

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RR

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TIE

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ME

RC

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UR

PO

SE

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ME S

TAT

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AB

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5. 

TH

IS W

AR

RA

NT

Y GIV

ES Y

OU S

PE

CIF

IC L

EG

AL R

IG

HT

S, A

ND Y

OU M

AY A

LS

O HA

VE O

TH

ER 

RIG

HT

S WH

IC

H VA

RY F

RO

M STA

TE T

O STA

TE

.

SELLER:

Dometic Corporation - Sanitation Div.

13128 SR 226

Big Prairie, Ohio 44611 USA 

330-439-5550

Lo

ca

tio

n of p

ro

du

ct I

D la

bel

Operation

7.1 

Add water to bowl 

To add water to the toilet, pr

ess the flush pedal 

part way down.  Water flows into the bowl while 

flush ball remains closed.  If the flush ball moves, 

let up on the pedal slightly.  Adding water to an 

empty bowl helps prevent holding tank odors fr

om 

entering the living space. Adding water is recom

-

mended prior to flushing solids and toilet paper.

7.2 

Flush toilet

To flush, pr

ess pedal down until it contacts the 

floor.  Release pedal after complete flush.

• 

When flushing liquids, press the pedal for 1-2 seconds.

• 

When flushing solids, press pedal until contents ar

e rinsed from bowl. Flushing longer than 

 

necessary will cause holding tank to fill too quickly.

A small amount of water will collect in the bowl after a flush to create an airtight seal.

 

No

te

 

Resid

ua

l w

ater

 trick

le i

n c

era

mic b

owl

s

: Du

e to i

nte

gra

ted r

im o

f mo

del

s 310

, 311

, 320 

an

d 321 t

oile

ts, wa

ter m

ay co

ntin

ue t

o tri

ckl

e int

o to

ile

t bo

wl f

or u

p to 20 m

inu

tes a

fte

flus

hin

g. I

f wat

er t

ric

kle c

ont

inu

es a

fte

r 30 m

inu

tes

, rep

lac

e wate

r val

ve.

Note

 

To ensur

e holding tank odors do not enter the living space, make sure 1 inch (24 mm) of 

water remains in the toilet bowl. Depending on variations in plumbing systems and user 

operation, the “add water” function may be requir

ed to achieve the 1-inch water depth.

Cleaning

8.1 

Routine toilet cleaning

For routine cleaning, use SeaLand

®

 Toilet Bowl Cleaner

. If this cleaner cannot be found in your area, 

contact Dometic for your nearest dealer

. If the cleaner is not available, use most any non-abrasive 

bathroom and toilet bowl cleaner

. Please follow label instructions.

For stubborn stains on model 300 and 301 toilet bowls, car

efully use rubbing alcohol to remove them.

   

8.2 

Flush ball/seal cleaning 

After a period of time, mineral deposits from har

d water may 

build up on the flush ball or seal, resulting in a slow water 

leak. To pr

event this, periodically clean the flush ball and seal.

1. 

Remove minor debris from the flush ball and seal by 

slowly pressing and r

eleasing the flush pedal several 

times. This will loosen and rinse debris from the surfaces. 

Repeat several times for stubborn buildup.

2. 

If step 1 does not fully clean the ball and seal, clean with a soft bristle brush and SeaLand toilet 

bowl cleaner.  Fully clean the top of the flush ball and under the seal wher

e it contacts the flush 

ball.  After cleaning underside of seal, apply light downward pr

essure to top of seal while 

 

brushing around full perimeter of seal. 

3. 

If this does not correct a leaking seal, it may r

equire r

eplacement. 

Flush directions ar

e located under 

toilet seat lid.

Gravity-flush toilet

Instruction manual

EN

SANITATION

TOILETS

300 Series, 310 Series, 320 Series Toilets

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