How to properly cap off dishwasher drain

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Round Rock, Texas
Hello everyone- I'm assisting someone with the removal of a dishwasher that is broken. The owner has no desire to replace it and just wants the entire unit taken out, which is not a problem for me. The only question that I have is how to properly cap off the connection at the P-trap resulting from the drain hose removal (see attached image # 1). I went to my local home improvement store the other day seeking advice in their plumbing department and was told to simply pick up some rubber furniture leg tips (see image # 2) and to slide one of those over the opening after removing the drain hose. Was told that I wouldn't need to clamp it either. For all I know that may be a perfectly acceptable practice, but thought I'd ask in here just in case there is a more "professional" option. Thanks in advance for all forthcoming replies.


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