Question about Swanstone KSDB-3120 Compact Double Bowl Kitchen Sink, Black Galaxy

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I have a composit kitchen with knock outs for 4 faucets. How do I knock them out?

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Do NOT try to knock them out! The correct way is to drill them out as needed for your particular faucet. Refer to your installation instructions for your faucet to determine which holes need to be drilled out. There is a school of thought that it is best to drill them all and use a hole cover on those you don't use since once the sink is installed you will no longer be able to drill them at exactly factory locations.

You will need a 1-3/8" hole saw (my preference is Lenox brand # 30022), an arbor (a special drill bit for the hole saw Lenox brand # 2L), and preferably a varible speed drill.

Turn your sink upside down and place onto a clean padded surface to protect the finish and is also a padding that you can bear to throw away. Locate the center of the hole to be drilled. If there is no dimple from the manufacturer at dead center, you will have to give it your best guess. Mark that spot and with the arbor securely mounted into the hole saw, begin drilling at 1/4 to 1/2 speed of the drill, until the tip of the arbor had drilled completely through. Remove the hole saw and turn the sink right side up. The hole that the arbor made in now called a pilot hole and will guide your hole saw perfectly. By drilling from the top side you eliminate any chipping. Insert arbor into the pilot hole and begin drilling using light to moderate pressure until the hole saw has drilled through. Be careful! As you sense you are nearly through the drilling, only use light pressure so you don't lose control of the drill when the saw pops through and accidentally smack your sink.

Posted on Jun 01, 2010

  • lem_adm Dec 31, 2010

    This is good advice. I purchased a Pegasus composite granite sink from HD, and following the directions to "use a 6 oz ball peen hammer to tap on the sticker" to remove the knock out spelled DISASTER! I supported the underside (actually my wife did) with a hand (as directions indicated) and the whole darn corner cracked right off! Fortunately, HD is replacing it w/o a fuss.

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Posted on Jan 02, 2017

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