This 12-inch Low Profile Primary Shutoff from Chandler Vac features a 6-inch neck, 8-inch ball cage, and 6-inch stainless steel ball, and is designed to minimize vacuum tank height. With a weldable 12.25-inch O.D. base and easy access for quick clean-out, it ensures positive shutoff and operates efficiently at 385-450 CFM. Additionally, this model has a mild steel neck and lid, and a 3-inch opening.