Edelbrock #72294 Nitrous adapter solenoid performer to multiple solenoid bracket Square bore four solenoid bracket Billet aluminum, CNC-machined plate mounts four- and two-solenoid applications. Two-Solenoid kits can be used with Performer and Performer RPM nitrous systems for professional-looking installation. Match the four-solenoid brackets with our Performer RPM Dual-Stage, or Victor Jr. Plate System.