Well you’re supposed to but I certainly have done it reusing the old one. Never had a problem using one again but I’d nevertheless recommend you lay in a small supply from a ford dealer or from a parts store - though you might have to take an old one to the store to match.
Or you can buy a drain plug valve like I did. It screws in once then you just turn the valve for future oil changes. Costs about $35. Makes it easy and you can even attach a plastic hose to the valve so that you can drain directly into a jug.
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