Push-in fittings for rigid tubing are single-piece fittings without a compression ring found in other rigid fittings. Push-in fittings have multiple internal o-rings and rely on friction between the o-rings and the tubing for retention and sealing. One advantage of push-in fittings is cost, as they are normally more economical than compression fittings. Another is space. Without a compression ring and threads, push-in fittings can be shorter than compression fittings – good for those places where a few millimeters of clearance will make a difference. TITAN RIG stocks push-in fittings for rigid tubing in over a dozen colors from several top brands.