Swap out cracked or cramped bowls with RV sinks that fit common drop-in and undermount setups. Sizes vary, so match your cutout to the flange; generally the hole should be at least 3/4" smaller. Installs can use L-brackets with wing nuts on studs or silicone sealant, and some drains glue with ABS/PVC cement instead of threading.
Plan for limited access and set hardware before dropping the sink in. Screws and tabs can be a bugger to set; dry-fit first, then slip L-brackets over studs and tighten the wing nuts in a clockwise rotation. If replacing an under-hung sink, you may need to trim the opening and adjust drain plumbing. Weight the sink while silicone cures to help it seat.
Measure the overall size and compare to your countertop hole. Generally, you want the hole to be at least 3/4" smaller than the sink flange itself. Many flanges are 1 inch wide around. Odd-size cutouts may require trimming the opening or notching tabs to get the rim flush. If your hole is wider than the flange, expect a small gap you'll need to fill or cover.
Some RV sink drains do not thread on and the tail piece glues to the sink. Have ABS/PVC cement for the drain pipe. Seal the rim with clear silicone; weighting the sink during cure helps. Some installers used double sided tape all around and then caulked the edges. If you're unsure, dry-fit the drain and check whether the tail piece glues to the sink.
Drop-in is easier to seal and install in RVs. It can be held in place with silicone sealant and weighted while it cures. Some sinks use L-brackets on threaded studs; slip the brackets on, lightly snug the wing nuts, then tighten in a clockwise rotation. Be careful with the threaded pems; they are not to strong, and check the threads with the wing nuts to make sure they will screw on.
RV sinks come in plastic and stainless steel. Plastic options have been exact replacements with good color match and easy installation. Stainless steel is available, including undermount designs. In an outside fish cleaning station, there was no warping or discolorations after one year and the sink cleaned up well afterwards.
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