Boyesen Replacement Pro Series Reeds for Rad Valve PSR-142NOTE: When ordering replacement reeds be advised that Rad Valves with part number stamped on side of valve require replacement reeds listed Pro Series and replacement reeds for the Rad Valves without part number stamped on side of valve require replacement reeds listed Unstamped Valves. 3 stage reed design: Low tension top reeds insure instant throttle response. Intermediate reeds increase mid range responsiveness and pull. High tension base reed