Part #........ KOU08922A-A Description... STAINLESS CHOKE TUBE Choke......... IMPROVED CYLINDER Size.......... 1 1/2" Fits.......... 28 GAUGE STAINLESS 400- & 410- SERIAL NUMBER PREFIX ONLY Note.......... RM CHOKE INSERT IS ROLLMARKED WITH CHOKE MARKING. THE INSERT MUST BE REMOVED TO IDENTIFY THE MARKING.