A connector having a tuning tube attached to a secondary fitting where said secondary fitting is secured to said connector using a press fit or a mating thread structure and where said tuning tube is pinched between two different bore radius sections within the connector and a sleeve section of the secondary fitting. In an alternate embodiment, the tuning tube is held by one or more barbs or sharp edged annular rings formed on the inside bore of the connector. The tuning tube can be made of one or more sections of tubing joined together.