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Old 09-12-2019, 04:39 PM   #1
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2013 Interstate Coach
Idaho Falls , Idaho
Join Date: Jul 2017
Posts: 99
Accumulator Tank, new sink & faucet

There have been other threads about installing a new sink and faucet in our Interstates. However, I could not find a thread about installing a new sink in the lounge model without going to an exotic trap such as the Mcalpine. If there another thread that addresses this, I apologize to the author.

The issue is we have a microwave immediately under the sink. With the factory sink the Hepvo trap rests on top of the microwave. The Houzer sinks that people have been installing are about 2 inches deeper than the factory sink.

Long story short - you can install the Houzer sink. In fact when I was done the Hepvo trap no longer rests on the microwave. The factory sink comes with about a 3 inch extension between the sink drain and the Hepvo. First trick is to leave that out and connect the Hepvo directly to the drain. The second trick is to not use the strainer that comes with the Houzer. I bought a Glacier Bay strainer from Home Depot that was shorter.

I did have to buy an extension to move the Hepvo to the middle of the sink since the factory sink drain is closer to the back. I just got this from Home Depot. I did install a new Hepvo for no good reason.

While I was working on the sink, I also installed a Shurflo Accumulator Tank. This was an easy installation. It comes with a connector that hooks the tank directly to the pump. This tank also fits nicely next to the pump, under the bottom drawer. I have easy access to the tank to recharge it if necessary just by removing the drawer. Much less pump cycling and much quieter pump.

The following gives links, or details on what I used. Many of these ideas came from the other threads and I greatly thank those owners. I list them again here just to have a complete thread. I have also attached pictures of the sink installation and the accumulator tank.

Sink: Houzer SCF-1830-1
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Sink drain: Glacier Bay 1001 977 405 Home Depot

Sink Bottom Grid: Houzer BG-1800
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Sink cutting board cover: Houzer CB-1800
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Hepvo 1 1/2 inch trap:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Shurflo 182-200 Accumulator Tank:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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Old 09-12-2019, 05:21 PM   #2
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2013 Interstate Coach
Raymond , Iowa
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I bought an accumulator tank but could not find a place to install it where I could be sure of being able to drain it during winterization. Can yours be drained while sitting on its side?
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Old 09-12-2019, 05:27 PM   #3
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Nice install, I have been planning one too. Did the accumulator tank come with the short union to connect to the pump? Did you consider the silencer kit with the flex hoses? Great that the pump is now quieter, Thanks
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Old 09-12-2019, 05:30 PM   #4
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Fulton , Maryland
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PASSIN-THRU - nice work. Looks like a great sink. Instead of accumulator, I installed a VSD water pump to replace the noisy original. No more pump noise.
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Old 09-12-2019, 05:45 PM   #5
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Idaho Falls , Idaho
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I pump rv antifreeze thru in winter so I donít foresee a problem with it being omits side.

I am familiar with the variable speed pumps having lived aboard boats for 8 years but have not gone that route on the coach

I am not familiar with the silencer kit.
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Old 09-12-2019, 05:47 PM   #6
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The connector to the pump did come with the accumulator tank.
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Old 09-14-2019, 09:46 AM   #7
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Gulf Breeze , Florida
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Quote:
Originally Posted by Boxster1971 View Post
PASSIN-THRU - nice work. Looks like a great sink. Instead of accumulator, I installed a VSD water pump to replace the noisy original. No more pump noise.
Boxster1971 - Can you please provide the make and model of the pump you installed. I would love to get rid of my noisy pump. Thanks.
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Old 09-14-2019, 01:55 PM   #8
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Quote:
Originally Posted by orlik View Post
Boxster1971 - Can you please provide the make and model of the pump you installed. I would love to get rid of my noisy pump. Thanks.
Sure - it is a Flojet Sensor VSD Model R4515-743, 3.7GPM. It is much quieter than the original pump installed by Airstream. One of the best mods I have made to my Interstate LoungeEXT. The pump on my Interstate is located under the lower drawer in galley cabinet. I've attached photos of the fit checks I made while installing. I don't have a photo of the final install but you can get the idea. I'm also attaching a copy of the spec sheet for this water pump.

Here is link to one source, they are widely available. . .
http://www.valuervparts.com/flojet-s...4v-r4515743a/#

Hope this helps,
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Old 09-14-2019, 02:18 PM   #9
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if you get the SHURflo 4008-101-E65 3.0 Revolution Water Pump
and use 2' of flex pipe on both ports, no accumulator is needed

saves space and $$
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Old 09-15-2019, 12:39 AM   #10
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This is great. I purchased that special drain but would rather use a normal one. Thank you for sharing the right one to get that would clear the microwave.
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Old 09-15-2019, 08:27 AM   #11
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Quote:
Originally Posted by Boxster1971 View Post
Here is link to one source, they are widely available. . . http://www.valuervparts.com/flojet-s...4v-r4515743a/#Hope this helps,
Thanks. Hopefully I can make the current fittings work without changes.
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