RUPP Marine Knob Silver For Morse Controls 3/8-24 Thread Control. Anodized aluminum in silver adds that special touch of class to any boat. Also available in gold. For throttle or shift. Sold individually. Specifications for RUPP Marine Control Knob Silver For Morse Controls 3/8-24 Thread: Manufacturer: RUPP Marine Color: Silver Package Contents: RUPP Marine Control Knob Silver For Morse Controls 3/8-24 Thread RUPP Marine 03-1226-23S: Knob Silver For Morse Controls 3/8-24 Thread Control