Do you have a stone yard in your area? It may be possible to find a remnant you can use. If you are committed to keeping your base, I'd check there first. It may be worth it even if you have to travel to one. Good luck!

Thanks so very much everyone. I really appreciate each of your kind replies and helpful information, I learned a lot! I get tired just thinking of doing all of this and the sink isn't leaking or anything as it's superficial at this point, but it's true that it could rust the cast iron once it starts to penetrate the coating but I am thinking that is a long way off. Boy, did I learn a lesson, never cheat a bigger sink into a smaller cabinet. It looks fine and not too big but the cabinet sides on the inside are where the problems begin. Not to mention another lesson I learned is that I had some left over granite but they offered to cut it for a large demilune furniture piece top in my foyer. I am wishing I had that piece now. I am not sure it would have been big enough just for the section around the sink but I will never know now. Thank you for the compliments on the kitchen, I am the no clutter queen but looking at that picture maybe I should let up a little on that, ha ha. When this is resolved I'll let you know what happened. It may be awhile! Linelle, I hope the problem with the sink base was answered for you in the helpful posts above. Thanks so much appreciate the kind words.

live_wire_oak: thank you so much for your response. A few pictures: What is all the white stuff? What does this valve control? The dishwasher (DW) is to the Left of the sink, so is that the hot water line to the DW? Doesn't the drain to the sink looks like it's corroding on the bottom? And doesn't all the connection on the PVC look dirty/about to fail? Do you own a basin wrench? - Yes, I can borrow one. Do you have individual shut off valves to the hot and cold water under the sink? Yes, 2 shut-off valves. Do they just have the one outlet? Or do you have a DW coming off the hot and a ice line for the fridge coming off of the cold? - Yes, a DW coming off the hot line, but NO ice line for the fridge off the cold line YET. - (for the future  about 5years from now, when we hook up the all-freezer, weÂd like the ice line coming from the water filter line: 1. is that possible? 2. should we set it up now, knowing that when I hook up the freezer/ice line, itÂll be w/ a whole new sink in a different location? What type of supply lines do you have? Copper? CPVC? Pex? - The immediate supply lines are ?flexible (see pictures). Are you keeping the same sink? - Yes, itÂs an integrated Corian sink to the countertop. WeÂre keeping it for ~5 years. Then IÂll have to do this all over again when we put in new stainless steel sink and seamless stainless steel countertop/backsplash. Have you had a dedicated electrical circuit run for the InstaHot? (that means it's on it's own wiring all the way back to the breaker box) - No, I donÂt. Is that required for code? - Any thoughts/possibility to connecting it to the DW electrical line? My DW has its own switch (like a light-switch) that controls the power to turn it on/off (childproof reason). PVC waste piping rarely needs to be replaced. It doesn't get old and brittle like galvanized does. Most likely, you can reuse the drain piping just fine, or just leave it alone if you're not replacing the sink or disposal. - See picture: looks really old, threatening to leak. - No disposal (septic system). I appreciate any and all help. Thank you so much. Amanda

I bought a used laundry sink and cabinet and once connected, there is a small leak from the old drain flange. I unscrewed the nut and carefully removed the sink flange. The old putty was crumbling and missing in places. There were no gaskets. The drain flange is in good shape. Can I reuse the flange? Do I need to use rubber gaskets? If so where? I could buy a new flange kit for about $6 that has the gaskets included. Would this be a better idea? Also, the sink flexes some when filled with water, should I use plumbers putty or 100% silicone to seal the flange to the sink? Thanks in advance!