This is most popular Dart style gasket. You will find this profile on reach-ins and walk-ins. Some popular reach-ins are Traulsen, Glenco, Star Metal, Beverage-Air, Kelvinator, McCall, Jordan and Vulcan-Hart. Some popular walk-ins are Hobart, Hartford, Masterbilt, Nor-Lake, Vollrath, Kolpak, Vulcan and American Panel. This gasket may snap into a gasket track. On older units, it may slide between the door pan and the outside skin of the door. This gasket can be measured from the outside corner to the outside corner of the hard base or from the groove to the groove that the gasket snaps into.