Get checkbox with specific value

<input type="checkbox" name="priv"​​​​​​​​​​​​​​​​​​​​​​​​​​​​​ value="1"​​​​​​​​​​​​​​​​​/>
<input type="checkbox" name="priv" value="2"/>
<input type="checkbox" name="priv" value="3"/>
<input type="checkbox" name="priv" value="4"/>
<input type="checkbox" name="priv" value="5"/>
<input type="checkbox" name="priv" value="6"/>
<input type="checkbox" name="priv" value="7"/>

 <input type="checkbox" name="priv" value="8"/>​

$(":checkbox").filter(function() {

  return this.value == '5';
}).prop("checked","true");​

If you want to use it for different values then make it generic like following:

function checkWithValue(val) {
    $(":checkbox").filter(function() {
        return this.value == val;
    }).prop("checked", "true");
}


checkWithValue(5);​

DEMO