Abstract: An oil well swabbing device having a pressure activated valve for use in closing a fluid passage therein when the swabbing device is submerged under liquid in a well casing corresponding to a predetermined valve closing pressure; the pressure-activated valve comprising a pressure collapsible bladder such as a bellows or diaphragm, a valve and seat interposed in the fluid passage, and an actuator rod connecting the valve to the pressure collapsible bladder such that the valve is closed when the bladder is collapsed to a degree corresponding to the predetermined valve closing pressure. Improved speed brakes, catchers, and position indicators for oil well swabbing devices are also disclosed.