Thursday, January 27, 2022


Replace your RV’s annoying two-cavity sink with one large one

This is the third installment in a series of customizations, upgrades and changeouts to better fit one’s RVing lifestyle. In the second article in this series, I noted a full-timer who replaced their dishwasher with a dual pullout spice rack for cooking proximity (you can read about it and see photos here). Their tradeoff? Hand-washing dishes and cookware. This installment we cover replacing the RV sink.

A common two-cavity sink in motorhomes. Note how shallow it is.

As a full-timer, the notion of maximizing space to fit one’s lifestyle makes complete sense. While two-cavity sinks look great, those models with one smaller cavity, like ours in the above photo, are basically useless. Yes, I’ve cleaned kettles and pans on the large side, but not without careful movement so as not to splash water on the counter and floor. Been there and done that a few times!

When cooking and cleanup is important to your lifestyle

RV sinks are smaller in overall dimension (especially depth of the sink cavity) than many household models. Unless your RV’s sink is large enough to wash oversized cookware, an undersized dual sink may not suit your long-term needs. They look good, but many household models dedicated the small cavity to a garbage disposal. Disposals are not typically offered in RVs. If garbage disposals were to be used, a macerator pump is necessary. Think of the smell and ecosystem that would be growing in your gray tank. Ew!

Full-timers who changed out their RV sink

Some full-timer friends of ours recently changed out their stainless steel dual sink to a one cavity undermount. The Hodgsdons of Florida shared their sink trade out experience with me. They love cooking and I attest to their culinary delights on more than one occasion.

The Hodgsdons decided to make cleanup a lot easier in their 2019 Tiffin Phaeton. Knowing they were not interested in making this changeout a DIY project, they contacted one of Tiffin’s cottage industry facilities experienced in renovation. The facility gave them the critical dimensions for the one-cavity undermount sink. After choosing their replacement from Home Depot, they learned it was not in stock and obtained it from Amazon, shipping it directly to the facility in Red Bay, Alabama.

Note: You can find a ton of RV sink options on Amazon, but triple-check sizing before ordering!

The sink was approximately $300, a new faucet and drain were $150, and installation was just shy of $300. That brings their total sink cost to $750.

One large sink now accommodates kettles and large cookware with no wasted space.

Thinking about this DIY project?

Thinking about following suit? Changing out a double sink for a single sink sounds easy. It’s not. If you’re not handy at plumbing and carpentry, think about employing someone who works on renovating RVs. It helps to be a contortionist as removing the old sink is no picnic. You’ll be working in a confined area while on your back.

For you DIYers…

During our research, I asked Nathan Davidson of Davidson RV why RV sinks tend to be shallow. Nathan tells me it’s necessary for proper drainage. So, if you decide to make this a DIY project, make sure the dimensions are spot-on. Don’t buy a deep sink without insuring you will have adequate room for proper drainage. Ask a plumber if you’re unsure.



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5 months ago

I am fortunate in that my sink is like a house sink both sides the same. One side fits a dishrack and is solely used for that. I would never want to replace it.

John Koenig
5 months ago

The OEM divided sink in my 2015 Dynamax DX3 was TERRIBLE. Neither side allowed a standard dinner plate to lie flat on the bottom of the sink (and forget about pots or pans). I got a Dynamax factory tour right after I purchased my DX3 and mentioned this problem. The Dynamax manager basically blew me off. In 2019, I paid a custom shop to replace the crap OEM sink with a MUCH more useable, single bowl stainless steel sink. I also paid for a commercial grade faucet. Said upgrade is SO much better that the dual bowl OEM crap. Obviously, the clowns um “designers” who choose what goes in to their RVs RARELY (if ever) actually DO any real RVing. PS: for the VERY few times a “dual bowl” would be advantageous, I simply use a plastic Rubbermaid or Sterlite bin. Once said “need” has been satisfied, the bin comes out and I have my LARGE bowl sink again.

5 months ago

When we ordered our Newmar, we ordered it with a single sink so we would have room to wash pots, etc. We don’t regret it at all. Home sink is same way.

Our first MH had a double sink and it was frustrating for the 10 years we had it.

5 months ago

In my Epro 19 recently changed the factory sink to a larger bar sink from Lowe’s. Since was about 2 inches deeper had to notch the drawer below for the drain to clear. Takes up just a couple inches of drawer space and doesn’t affect me. With new faucet too, it’s like night and day over what I had. Can actually wash a dish or pot without water going all over the counter. Under $200 and couple hours, mostly checking measurements before cutting

Thomas D
5 months ago

Now that they have 1 sink, where or how do they rinse dishes. My first home had an old farmhouse sink. Like 54 inches long, big drainboard. Put the washed dishes on the drainboard and pour water over them and let water run into sink,being careful not to overflow sink. Not really a good rinse job and a large waste of water i think.

5 months ago
Reply to  Thomas D

That’s what I thought. One sink for wash, one for rinse.

5 months ago
Reply to  chris

Yep. Another solution looking for a problem.

5 months ago
Reply to  Thomas D

We have a farm sink in our motorhome, we found a dish strainer that just squeezes in leaving several inches under it for dishwater.