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09-09-2014, 10:39 AM
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#1
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,364
M.O.C. #4831
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Dometic 310 & 320 - What's the Difference?
My Thetford tried to flood us out again yesterday. That will be the last time. I see you folks talking about Dometic 310 and 320 models. What are the differences between the two? I can see the price differs and it appears the 320 has an elongated bowl. What else?
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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09-09-2014, 12:48 PM
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#2
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Montana Master
Join Date: Aug 2010
Location: Washington Coast
Posts: 2,688
M.O.C. #10696
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Also better seat and Lid on the 320 that is wood instead of cheap plastic on the 310 both can be bought with a sprayer,....Hey welcome to the FLOOD CLUB
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09-09-2014, 01:48 PM
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#3
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,700
M.O.C. #12947
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If you don't care for the elongated bowl of the 320, the wood seat assembly can be bought for the 310 to replace the standard plastic seat. So far, the plastic seat works well after about nine months. You will not regret tossing the Thetford. Even though, we never had a flood, the cheap design of the Thetford was a constant worry after the pedal flew off late one night.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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09-10-2014, 07:14 AM
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#4
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Montana Master
Join Date: Nov 2013
Location: Willow Spring, NC
Posts: 992
M.O.C. #13909
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Let me add a question. I looked closely at the 310 and 320 at CW next to a Thetford display of a toilet that looked like the one in my 3402RL. I'm not sure that the 320 could fit in my toilet room because the position of the vertical waste pipe. Has anyone replaced the 2014 3402RL standard toilet with a Dometic??
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Jim & Martha Abernathy
2014 Montana 3402RL Level UP, Sailun S637's, TST 507, 500W solar
2014 Ram 3500 Laramie® 4x2 diesel dually crew-cab 3.73 axle, Reese R20
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09-10-2014, 08:09 AM
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#5
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Montana Master
Join Date: Aug 2010
Location: Washington Coast
Posts: 2,688
M.O.C. #10696
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That was my worry when I had my 3402RL and that is why I went with the 310 and it worked out great except I had to buy a 1FT flexable 1/2in hose and a female to female adapter for one end because the Thetford water inlet is up high and the Dometic is low and also you have to use the old Thetford gasket because the Dometic is shaped different and also you get a little extra room in the POO POO closet with the 310 because it is a skinnier design
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09-10-2014, 08:15 AM
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#6
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Montana Master
Join Date: Nov 2013
Location: Willow Spring, NC
Posts: 992
M.O.C. #13909
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Good to know
__________________
Jim & Martha Abernathy
2014 Montana 3402RL Level UP, Sailun S637's, TST 507, 500W solar
2014 Ram 3500 Laramie® 4x2 diesel dually crew-cab 3.73 axle, Reese R20
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09-10-2014, 12:00 PM
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#7
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,364
M.O.C. #4831
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I did find where the mounting offset is different between the two. The 310 needs a minimum of 10" vs. the 320 with 11" from the wall to the center of the drain pipe.
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09-10-2014, 02:23 PM
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#8
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,700
M.O.C. #12947
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Took the Thetford out, installed the Dometic 310, and the only thing I needed to do was pull the Pex line up a bit through the hole in the floor, and connected it to the inlet on the new toilet. I guess I was lucky, not having to extend the Pex.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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09-11-2014, 04:01 AM
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#9
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Montana Master
Join Date: Aug 2010
Location: Washington Coast
Posts: 2,688
M.O.C. #10696
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Yeah I was able to pull the pex line up more and made it work for a week or so but it was at a weird angle and started to leak so that is why I went with the flex extension to make the connection straight on and all is good now
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