O-Series Subs

Equalize pressure in subsurface controls for safe slickline retrieval

O and O-1 equalizing subs connect a C- or M-series lock to an equalizing sub to equalize differential pressures across slickline-retrievable subsurface controls before retrieving the controls from the tubing string.The difference between the O and O-1 subs is that the O-1 sub has internal threads to receive chokes. 

These subs are designed for use in sweet to moderately corrosive environments.