The Autopilot 312-A-SVC is a Nut for a 2" Union compatible with a Professional Manifold. Autopilot has been the leading swimming pool salt chlorine generator manufacturer since 1976, offering a full range of units to meet any chlorine need. AutoPilot® can maintain anything from small above ground pools up to very large commercial facilities. This Nut for a 2" Union is a genuine Autopilot product.