This is a new old stock AC Delco genuine original part no WS18 - 7954470

Designed for use with lorry truck air pressure brake systems it is designed to operate between 55-65lbs / 380 - 450 KPa - this would operate a buzzer switch in the cab to warn of low air pressure in the system ( please see my listing for these )

This is a high quality OE part made in the United Kingdom in the 1960’s / 70’s

Other stamps on the switch - 12B6 4390

Length overall - 66mm width overall - 28mm

spanner size looks to be about 16mm with a taper thread of approx 1/2 inch

Applications - with air pressure braking systems

Bedford KM with 466 engine 1960-69

Commer 10 ton 12 ton 1966 onward

Please examine the photos carefully to ensure this is the correct one for you