If there is an unused branch of a drain it can be blocked certainly. You can buy stoppers which are usually used for blocking drains while they are tested for leaks but they can be used for this also. They screw into the drain and can be unscrewed again if ever they need to be but they can also stop in permanantly. You can buy them from any builders merchants.
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DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!