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RV Sinks - Undermount, Rectangular Sink

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RV Sinks for undermount rectangular sink installs

Choose an undermount rectangular sink to fit RV countertops that allow below-counter installs; granite works when you use an adhesive suited for stone. Match the sink to your cutout, decide on single or double bowls, and check whether undermount mounting hardware is included or if separate brackets are needed.
It's not ideal. You could caulk the bottom of the lip to the countertop, but thin gauge without a bevel may not look the best. If your countertop isn't water resistant, avoid undermount and look for a top-mount model sized to your cutout.
Yes, undermount sinks can be installed to granite. Use an adhesive that is suitable for stone to secure the sink. Make sure your countertop material can support an undermount install and follow the adhesive manufacturer's directions.
Not all undermount sinks include undermount hardware. Some arrive with brackets for drop-in only, so plan to source undermount brackets if they aren't listed. Before installing, confirm the hardware type in the description and be ready with adhesive or brackets as required.
Match the sink's exterior size and bowl dimensions to your countertop opening. Check for rounded corners and compare the bowl size minus any flange so the basin sits where you want it. If you have a specific cutout like 25-3/4 x 14-3/4, verify the sink options listed to fit that opening.
Both work; pick what suits your space and plumbing. A single bowl can free up room for larger items, while a double may need a drain change to accommodate two drains. If the replacement is a little shallower, you may need a drain pipe extension.