Replacement Kitchen Sink for RV: How to Measure, Choose and Install the Right One

Water stains around the faucet, a hairline crack along the rim, or a worn out cooktop cutout eventually push every RV owner toward the same project: replacing the kitchen sink. Here is the short answer first. A dependable replacement kitchen sink for RV use is almost always a 304 stainless steel bowl, sized to the existing countertop cutout and mounted from above with a sealant bead and clips. Get three decisions right, measure first, choose 304 stainless second, match the layout third, and the new bowl will outlast the rest of the galley. The sections below walk through each decision with the numbers that matter.

Measure the Cutout First, Because Fit Decides Everything

Before comparing products, record four figures from the existing installation. Measure the countertop cutout width and length, not the old sink, because the flange is always larger than the hole it covers. Note the corner radius, usually between 6 and 25 mm, since sharper corners will not drop into a rounded opening. Check the clearance to the backsplash and front edge so the new flange can sit flat. Confirm the faucet hole spacing as well; most RV faucets use a single hole or a 4 inch centerset.

1. Measure cutout width and length at the narrowest points.
2. Check the corner radius with a coin or a radius gauge.
3. Measure bowl depth and confirm clearance for the drain trap below.
4. Count faucet holes and measure their spacing.
5. Weigh the old sink if possible so the new unit stays in the same load range.

Why 304 Stainless Steel Is the Default Replacement Material

Material choice is where RV replacements differ most from household upgrades. A mobile kitchen lives with vibration, humidity during storage, temperature swings and occasional salt air, so the material must resist corrosion without adding weight. 304 stainless steel, an alloy with 18 percent chromium and 8 percent nickel, meets those demands and has become the standard for RV, caravan and marine sinks. Cheaper grades save a little up front but tend to show surface rust within a few seasons.

Choose a Layout That Matches How You Cook

Once size and material are settled, the remaining decision is layout. Three formats cover nearly every replacement scenario.

Rectangular Single Bowl With Glass Cover

This is the most common swap because it mirrors household proportions while staying light. The tempered glass cover doubles as a preparation surface when the bowl is not in use, which matters in a galley where counter space is measured in inches.

304 Stainless Steel Single Bowl RV Sink with Glass Cover A compact single-bowl sink in 304 stainless steel with a tempered glass lid that doubles as a work surface, sized for caravans and motorhomes where counter space is limited and proportions matter. View Product →

Cooker Sink With Integrated Cover

If the cooktop is worn out too, a cooker sink pairs one or two burners with the bowl behind a glass cover, consolidating two appliances into a single opening. That reduces the number of countertop cuts and simplifies the gas and plumbing runs.

304 Stainless Steel RV Cooker Sink with Glass Cover This cooker sink pairs a gas burner with a stainless bowl behind one glass cover, cutting countertop openings and simplifying gas and plumbing runs when both cooktop and sink need replacing. View Product →

Gas Stove and Sink Combo

For full galley rebuilds, a combined gas stove and sink unit replaces separate appliances with one stainless assembly. Builders favor it for compact motorhomes, campers and boats where every inch of counter must earn its place.

Integrated Campervan Hob and Sink Combi with Glass Lid A one-piece gas stove and sink assembly in 1 mm 304 stainless steel with a satin electropolished finish, suited to full galley rebuilds in campervans, caravans and boats where every inch counts. View Product →

Gauge and Grade: The Numbers That Predict Longevity

Two numbers on the spec sheet predict how a sink will age: sheet thickness and steel grade. Look for 0.8 to 1.0 mm thickness, sometimes listed as 20 to 22 gauge; thinner sheet drums under running water and dents easily, while thicker sheet adds weight the countertop does not need. On grade, insist on type 304, sometimes marked 18-8 for its chromium and nickel content. The chart below shows why grade matters more than any other material decision.

Installation Sequence and the Mistakes That Cause Leaks

Replacement itself is a one afternoon job with hand tools. Work in this order:

1. Shut off the pump, open the faucet to release pressure, and disconnect the supply and drain lines.
2. Cut the old sealant bead along the flange with a utility knife and remove the sink.
3. Scrape the countertop opening clean so the new flange seals against bare surface.
4. Dry fit the new sink and confirm the faucet holes line up before any sealant is applied.
5. Run a continuous bead of silicone under the flange, set the sink and press evenly.
6. Install the mounting clips from below, working opposite corners to keep the flange flat.
7. Reconnect plumbing, run water for two minutes and inspect underneath with a flashlight.

The most common failure point is the sealant, not the sink. Use a marine grade silicone, apply it in one unbroken bead and resist over tightening the clips, which warps thin stainless flanges. If you are unsure how the supply side is plumbed, our guide to what supplies water to the RV sink covers the pump, lines and check valves you will disconnect.

When Standard Sizes Do Not Fit, Work From a Drawing

Older caravans, custom builds and European imports sometimes have cutouts that match nothing on the shelf. In that case, order from a manufacturer that forms deep drawn stainless steel parts as per drawing or samples . Deep drawing shapes the bowl from a single sheet with no welded corners, which removes the seams where rust usually starts. A factory that builds its own tooling can adjust bowl depth, deck layout and corner radius to your measurements instead of forcing you to cut the countertop.

Swapping an RV kitchen sink is a one afternoon project when measurements come first. Confirm the cutout, choose 304 stainless steel in 0.8 to 1.0 mm sheet, pick the layout that matches your cooking habits, and seal it with one continuous bead of marine grade silicone. Do that, and the new bowl will shrug off potholes, humid storage and hot pans for as long as you own the vehicle.