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03-20-2023, 08:38 PM
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#1
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Senior Member
Join Date: Jan 2023
Location: Bella Vista, Arkansas
Posts: 190
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Toilet Replacement?
I am on my maiden trip and the Dometic Model 310 Gravity Flush toilet has to be the worse toilet on the market.
What is a good replacement that is easy to swap out?
__________________
Raymond, Dee Dee and Sophie (Yorkie)
2023 Chevrolet 2500HD LT
2023 Forest River Vibe 26RB
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03-20-2023, 08:52 PM
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#2
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Senior Member
Join Date: Jul 2017
Posts: 3,718
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Quote:
Originally Posted by reubenray374
I am on my maiden trip and the Dometic Model 310 Gravity Flush toilet has to be the worse toilet on the market.
What is a good replacement that is easy to swap out?
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Whats the problem , my 310 works great .
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03-20-2023, 08:57 PM
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#3
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 17,600
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Quote:
Originally Posted by MR.M
Whats the problem , my 310 works great .
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Agreed. The 310 is one of the most used toilets (no pun intended) in R/V manufacturing. It has a porcelain bowl and has replaced the often leaking 300 that's all plastic.
What exactly is your issue?
__________________
2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2017 Ford F-Series SCREW 4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
F&AM Lodge 358 Somerset, PA - JAFFA Shrine - Altoona, PA
Days Camped ☼ '19=110 ☼ '20=116 ☼ '21=123 ☼ '22=134 ☼ '23=93
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03-20-2023, 09:17 PM
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#4
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Senior Member
Join Date: May 2019
Posts: 3,401
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Another positive vote for the 310. Ours came in a 2020 Sunseeker. It’s sturdy and mostly trouble free. It did take a year or so for the gate seal to set and work well.
__________________
2020 Sunseeker 2440DS on 2019 Ford E-450, Trekker cap, Topaz paint
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03-21-2023, 06:31 AM
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#5
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Senior Member
Join Date: Jan 2023
Location: Bella Vista, Arkansas
Posts: 190
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Maybe I have the wrong model number. I think I have the 300 model instead. The toilet I have is all plastic. It sounds and feels like it is falling apart when sitting on it. Another thing is I like the elongated version like the model 320. The model 300 weights only 8 pounds where the 320 weighs 37 pounds. I can handle the weight, but is my floor strong enough?
How hard would this be to swap out?
__________________
Raymond, Dee Dee and Sophie (Yorkie)
2023 Chevrolet 2500HD LT
2023 Forest River Vibe 26RB
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03-21-2023, 07:30 AM
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#6
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Part-Time Campground Host
Join Date: Jul 2019
Location: Upstate NY
Posts: 2,774
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The 310 is heads above the old 300s. I replaced ours years ago and still like the 310.
Beware....the 320 is not a "plug & play" replacement for the 300 like the 310. Take your measurements carefully the 320 may not fit.
__________________
Craig & Cath
2018 2902WS Rockwood Ultra Lite (with tons of Mods)
2022 F250 Lariat Super Cab, 7.3 gas w/10 Spd Xmsn
Equalizer Hitch w/4-Point Sway Control

Days camped since 2015(retirement): 1490
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03-21-2023, 09:26 AM
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#7
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Senior Member
Join Date: Jan 2023
Location: Bella Vista, Arkansas
Posts: 190
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Quote:
Originally Posted by cboss
The 310 is heads above the old 300s. I replaced ours years ago and still like the 310.
Beware....the 320 is not a "plug & play" replacement for the 300 like the 310. Take your measurements carefully the 320 may not fit.

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Thanks - this is why I asked the question.
__________________
Raymond, Dee Dee and Sophie (Yorkie)
2023 Chevrolet 2500HD LT
2023 Forest River Vibe 26RB
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03-21-2023, 09:33 AM
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#8
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Kanadian Kamper
Join Date: Sep 2010
Location: Southern Ontario
Posts: 6,966
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Quote:
Originally Posted by cboss
The 310 is heads above the old 300s. I replaced ours years ago and still like the 310.
Beware....the 320 is not a "plug & play" replacement for the 300 like the 310. Take your measurements carefully the 320 may not fit.

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X2
Quite often, people find that because the 320 is elongated, there’s not enough room behind the 320 and a wall. The toilet still has to sit directly over top of the collar on the floor. I believe you’ll find all the specific dimensions for their toilets on their website.
__________________

Ken and Terry
2018 Sunseeker 2430S-CD, nicely modified and carried by a 2017 Ford E450 Sport
Former Georgetown 330TS owner for 10 years with more mods than I can count, pushed by our 2017 GMC Terrain
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03-21-2023, 09:34 AM
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#9
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Site Team
Join Date: Mar 2014
Location: Grayson County, Texas
Posts: 20,354
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Quote:
Originally Posted by reubenray374
Maybe I have the wrong model number. I think I have the 300 model instead. The toilet I have is all plastic. It sounds and feels like it is falling apart when sitting on it. Another thing is I like the elongated version like the model 320. The model 300 weights only 8 pounds where the 320 weighs 37 pounds. I can handle the weight, but is my floor strong enough?
How hard would this be to swap out?
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Maybe you could take a pic of the label so you’d know for sure which toilet you have.
__________________
2015 FR Wildcat 295RSX / GMC Sierra
Nights Camped: '13 = 49/'14 = 74/'15 = 74/'16 = 85/'17 = 110/'18 = 111/'19 = 86/'20 =108/'21 = 115/'22 = 135/'23 = 36; Booked for 2023 = 28
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03-21-2023, 10:15 AM
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#10
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Senior Member
Join Date: Jan 2023
Location: Bella Vista, Arkansas
Posts: 190
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Quote:
Originally Posted by Mr. Dan
Maybe you could take a pic of the label so you’d know for sure which toilet you have.
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It is the Dometic model 300.
__________________
Raymond, Dee Dee and Sophie (Yorkie)
2023 Chevrolet 2500HD LT
2023 Forest River Vibe 26RB
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03-21-2023, 10:22 AM
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#11
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Senior Member
Join Date: May 2020
Location: Right in the Middle
Posts: 978
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Asked and answered: the 310 is miles better than the 300 and is easy to install. Weight difference is primarily because of porcelain vs plastic construction. Will cure all your ills. 320 won't fit in some smaller RV bathroom's tight spaces, but your 26RB has a lot of real estate around the throne (got to like a RB for that feature). From the floor plan, I'd guess (note: guess) that it SHOULD fit (elongation adding mostly to the front of the bowl from the hole), just make sure to measure before purchasing (using a fitment guide on their website) and/or check shipping and return policy from your source.
As to weight: not an issue - units have the same construction from toilet to toilet, just a switch to a different fixture to install at the factory.
__________________
2022 Rockwood Roo 235S
2017 Audi Q7 3.0
WeighSafe hitch
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03-21-2023, 10:38 AM
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#12
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Kanadian Kamper
Join Date: Sep 2010
Location: Southern Ontario
Posts: 6,966
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Quote:
Originally Posted by reubenray374
It is the Dometic model 300.
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Not exactly sure what your issue is with the 300.
Your first post said gravity flush toilet.
310 is better. 320 is best, but they’re ALL GRAVITY FLUSH. They’re RV toilets.
__________________

Ken and Terry
2018 Sunseeker 2430S-CD, nicely modified and carried by a 2017 Ford E450 Sport
Former Georgetown 330TS owner for 10 years with more mods than I can count, pushed by our 2017 GMC Terrain
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03-21-2023, 11:56 AM
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#13
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Senior Member
Join Date: Jan 2023
Location: Bella Vista, Arkansas
Posts: 190
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Quote:
Originally Posted by Rhumblefish
Asked and answered: the 310 is miles better than the 300 and is easy to install. Weight difference is primarily because of porcelain vs plastic construction. Will cure all your ills. 320 won't fit in some smaller RV bathroom's tight spaces, but your 26RB has a lot of real estate around the throne (got to like a RB for that feature). From the floor plan, I'd guess (note: guess) that it SHOULD fit (elongation adding mostly to the front of the bowl from the hole), just make sure to measure before purchasing (using a fitment guide on their website) and/or check shipping and return policy from your source.
As to weight: not an issue - units have the same construction from toilet to toilet, just a switch to a different fixture to install at the factory.
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Checking the dimensions the 320 will not fit. I will order the 310 to replace the plastic 300. The wall distance on the 320 is too close to take the chance.
__________________
Raymond, Dee Dee and Sophie (Yorkie)
2023 Chevrolet 2500HD LT
2023 Forest River Vibe 26RB
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03-21-2023, 12:04 PM
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#14
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Senior Member
Join Date: May 2020
Location: Right in the Middle
Posts: 978
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You'll be pleased. The 300 -> 310 mod is one many here have made, and leaves them much happier than dealing with that old plastic pot (plus the swap fixes the urine smell that some have reported).
__________________
2022 Rockwood Roo 235S
2017 Audi Q7 3.0
WeighSafe hitch
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03-21-2023, 04:50 PM
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#15
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Senior Member
Join Date: Jun 2011
Location: Big brown desert
Posts: 3,001
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Quote:
Originally Posted by reubenray374
Checking the dimensions the 320 will not fit. I will order the 310 to replace the plastic 300. The wall distance on the 320 is too close to take the chance.
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How close is the back of your old toilet to the wall now? Looks like you will need at least 1.5 inches more from center of the flange. Is your black tank directly underneath and is it a pipe straight down?
I just replaced my thedford with tge 310 and I had to cut out the old flange and down pipe to install an enlongated flange to make the new unit work. If you do put in an enlonggated flange, pick up some thin lexan to make a “splash” guard. Basically you would be making a round hole for the toilet discharge to seal against instead of an oval one to splash out.
__________________
2014 Stealth Evo 2850- "Woodstock"
2011 Toyota Tundra Rock Crawler TRD 5.7- "Clifford"
2013 Honda Accord Coupe V6 w/Track Pack- "Julia"
Just glad to get away
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03-21-2023, 05:22 PM
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#16
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Senior Member
Join Date: Jan 2023
Location: Bella Vista, Arkansas
Posts: 190
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Quote:
Originally Posted by HONDAMAN174
How close is the back of your old toilet to the wall now? Looks like you will need at least 1.5 inches more from center of the flange. Is your black tank directly underneath and is it a pipe straight down?
I just replaced my thedford with tge 310 and I had to cut out the old flange and down pipe to install an enlongated flange to make the new unit work. If you do put in an enlonggated flange, pick up some thin lexan to make a “splash” guard. Basically you would be making a round hole for the toilet discharge to seal against instead of an oval one to splash out.
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It is 3" from the back of the flange to the wall. The black tank is directly underneath with a pipe straight down.
__________________
Raymond, Dee Dee and Sophie (Yorkie)
2023 Chevrolet 2500HD LT
2023 Forest River Vibe 26RB
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03-21-2023, 06:36 PM
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#17
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Senior Member
Join Date: Jun 2011
Location: Big brown desert
Posts: 3,001
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Quote:
Originally Posted by reubenray374
It is 3" from the back of the flange to the wall. The black tank is directly underneath with a pipe straight down.
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Ok. Measure how far the bolts at the bottom of toilet are to the back wall. Needs to be at least 10 inches for the 310 to work. You should be at 8.5 or greater currently.
__________________
2014 Stealth Evo 2850- "Woodstock"
2011 Toyota Tundra Rock Crawler TRD 5.7- "Clifford"
2013 Honda Accord Coupe V6 w/Track Pack- "Julia"
Just glad to get away
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03-21-2023, 06:58 PM
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#18
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Senior Member
Join Date: Jan 2018
Location: Raleigh, NC
Posts: 7,322
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Right!
Quote:
Originally Posted by reubenray374
Checking the dimensions the 320 will not fit. I will order the 310 to replace the plastic 300. The wall distance on the 320 is too close to take the chance.
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Right! The 300 and 310 have identical dimensions. The 320 needs a couple more inches at the back. If there's not two inches of air behind your 300, the 320 won't work.
If there's an interior wall behind the 300, some people have cut a notch in the wall to accommodate the 320.
__________________
Larry
Sticks and Bricks: Raleigh, NC
2008 Cherokee 38P: at Ivor, VA permanently
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03-21-2023, 07:24 PM
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#19
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Senior Member
Join Date: Apr 2021
Posts: 1,121
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After ONE trip I pulled out the Dometic 300 POS toilet and it went to the dump. I replaced it with a Dometic 310. I looked at the 320 but determined it would not fit in the space allowed without modification to the rear wall.
The 310 is a very good toilet.
Bob
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03-21-2023, 08:12 PM
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#20
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Senior Member
Join Date: Jan 2023
Location: Bella Vista, Arkansas
Posts: 190
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Quote:
Originally Posted by HONDAMAN174
Ok. Measure how far the bolts at the bottom of toilet are to the back wall. Needs to be at least 10 inches for the 310 to work. You should be at 8.5 or greater currently.
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I have 10 3/4" to the back wall
__________________
Raymond, Dee Dee and Sophie (Yorkie)
2023 Chevrolet 2500HD LT
2023 Forest River Vibe 26RB
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