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The Dor-o-Matic 1990 and 2090 Set Screw PB38. This set screw goes in the housing to secure it on the mounting studs. There is 3 of these screws on each housing, two on the left and right side toward the top, and one on the bottom. The manufacture is now Falcon.
Doromatic part # SCREW.1039 PB38