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Old 10-22-2018, 09:56 PM   #1
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Cool Dometic Masterflush 7640

I'm a new guy to the site, but not RV'ing Would appreciate chatting with anyone who has experience with Dometic's macerator toilet model 7640..

I want to upgrade from a Dometic 300. The fact the 7640 is a ceramic bowl in a plastic structure gives me pause. I understand the $$ saving reason --- but does the plastic move and squeak, or is it sturdy?.. Also how loud is the macerator?

I can't find any reviews of the 7640 -- only spec's

Thanks for any comments
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Old 10-23-2018, 05:15 AM   #2
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Welcome. You are joining a good group of folks here with lots of good info to share.

Sorry I can't help with the question but I am sure some one will be along with info for you

Enjoy the adventure.
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Old 10-23-2018, 09:15 AM   #3
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

Sorry I can't help with that question! Have fun and keep her between the ditches!

Good luck, happy trails, and God bless!
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Old 10-23-2018, 10:55 AM   #4
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Thanks for the good words.... In reading other places, It seems some are not happy with a macerator and think the Dometic 320 (gravity drop) with spray is the way to go...
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Old 12-15-2018, 08:51 AM   #5
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Quote:
Originally Posted by Super Tweak View Post
I'm a new guy to the site, but not RV'ing Would appreciate chatting with anyone who has experience with Dometic's macerator toilet model 7640..

I want to upgrade from a Dometic 300. The fact the 7640 is a ceramic bowl in a plastic structure gives me pause. I understand the $$ saving reason --- but does the plastic move and squeak, or is it sturdy?.. Also how loud is the macerator?

I can't find any reviews of the 7640 -- only spec's

Thanks for any comments
I am a professional marine/rv sanitation technician trained in many of the manufacturers toilet systems. I have installed the 7640 and other Masterflush toilets on both yachts and rv's. I have very rarely ever had ti service one. The only plastic part of the 7640 is the back cover the bowl and base are one piece ceramic. Most of the vacuflush pedal flush products including the 300 series have ceramic bowls and plastic bases, only the electric toilets are full ceramic. The 7640 does have a foot flush but its the exception.The macerator is not noisy at all. It mounts directly to the floor flange. The benefits are a sealed discharge so when you flush it does not open a 3 inch hole directly to the black tank so no odors like a gravity flush model. Because it macerates you rnd up with a slurry in the tank and not wads of tp and fecal matter so it lessens the chance if build up under theblack tank inlet. They retail for around $450, and you will need to get a 12 volt circut to the head. I have a brand new one in white that i was planing on putting in my old rv but we have since upgraded to a newer DP. [Mod Edit]
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Old 04-06-2021, 12:46 PM   #6
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Master Flush 7640

Wondering if anyone as any updates on the best macertor toilet for a 20 foot travel trailer. Also the best grey water recycler/filter so the toilet will flush with grey water?
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Old 06-16-2021, 01:50 PM   #7
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I am looking to replace my gravity toilet in our RV with the Dometic 7640 macerator toilet. Anybody have experience with the 7640?
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Old 06-17-2021, 05:19 AM   #8
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I have only seen 2 of them. One I installed on a boat and one on my rv ( I am a Dometic dealer ) IF you can find one they are good toilets. They are quite tall so if your existing toilet is on a step it will be way too tall. If it's mounted on the floor your good to go. Installation is easy.
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