The 3/16" Plastic connector I picked up is larger than the stock connector. However, the new plastic connector has a brass ring or something on the inside which makes one end of the connector actually smaller than the stock hole. Is this brass ring suppose to be there? Did I use the right connector? On the box it said 3/16" vaccum hose connector. Also, if it is suppose to be there does it matter which end the brass part connects to?