grooved mechanical piping systemThe Advanced Groove System (AGS) is the strongest Victaulic large-diameter grooved mechanical piping system, the company says. The only two-piece coupling on the market available in sizes up to 60 inches in diameter, AGS offers faster and simpler installation over couplings featuring multi-segment housings. AGS-joined pipe handles higher end loads and a higher-pressure rating up to 350psi/2,410kPA, with a nominal three-to-one safety factor.