Hot Water Heater Defroster Knob, 1939, 91A-18562-Y

Hydraulic switch, fits at master cylinder, cars & pickups, 1939-1948

.453" ID x .687", OD required to seal brake hose to front wheel cylinders & between 91A-2150 brake line bolt & 91A-2075 brake line connector, 1939-1948

70" long, 1939 cars, 1939-1941 commercial EXCEPT Sedan Delivery

122" long, includes (2) 91A-2597 rubber boots, 1939-1941 passenger and pickup, 1939 3/4 ton truck

Handle area, 1939-1942 passenger and 1939-1947 commercial

Black oxide, bolt with spring washer, hex head, 1/4-28 fine thread, 1939-1948 car. Used to attach hood arm supports or hinges in some years.