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Which valve do I need? There are so many to choose from, they are all different sizes, and the fittings change as well. This is why it is difficult to pick out the right valve for you car. Some valves are used in conjunction with others, and many are singular units which require no other valves. Most people call these items "proportioning valves," but very few are just that. Some are distribution blocks and others are hold-off valves.