Re: Does any one know what's missing or what goes here?

Posted by HH56 On 2013/10/10 12:20:51

The ball is not really a check ball as it's primary purpose. It will check if it is working properly, but is actually the activation for the switch. Without the rest of the switch components to hold it in the proper position, it would most likely roll away from it's passage. If that happens the vacuum can't pull it into position to block flow.