Smooth under-counter lines give your RV kitchen a polished upgrade. Undermount RV sinks sit beneath the countertop, so measure your cutout and bowl depth to match your space, and note how the sink secures—you may see threaded studs with L-brackets and wing nuts, and a solid seal matters. If the sink has no faucet holes, plan for a countertop-mounted faucet, and remember deeper bowls can mean minor plumbing adjustments.
Yes, some undermount styles can be set as a top mount. If there are no attachments for drop-in, a silicone or DAP style sealant bead can hold it—weight the sink while it cures. If the sink has studs and L-clips, follow that method for top-mount too. Check for studs that might keep the flange from sitting flush unless installed per the bracket instructions.
Confirm overall vs bowl size and the flange width. We've seen a 1 inch wide flange, where the bowl is overall minus 1 inch each way. Some installs call for a cutout 3/4" smaller than the overall length and width. Measure your opening and countertop clearance before ordering, especially corner radiuses and depth.
They commonly use threaded studs under the flange with L-brackets and wing nuts. Slip the L-brackets over the studs, lightly snug the wing nuts, then work in a clockwise rotation to tighten. Some sinks don't include undermount hardware, so confirm what's in the box. Be careful with the threaded pems; they're not too strong, and check the wing nut threads before install.
Pick based on how you use your space. A single basin helps with larger dishes and pots when shallow doubles feel cramped. A double basin gives separation but may require a drain change to accommodate double drains. Match the opening size and depth to avoid trimming or plumbing surprises.
A deeper bowl can mean a bit of extra plumbing work to hook it up. Some undermount sinks have no faucet holes, so plan to cut a hole in the countertop for a single mount faucet or accessories. Seal carefully—poorly sealed undermounts can let go and lift particle board. Clean, bead the sealant, and tighten hardware in a clockwise sequence.
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