Saver Sub TT390 Pin X 7-5/8" REG Box X-Over
Saver Sub used in top drive systems,connecting the joint between the Inside Blowout Preventer (IBOP) and the drill pipe. It serves both as a crossover and as a protection for the top drive plug valve.The Top drive Saver Sub can be divided into two types:conventional well drilling saver sub and low-temperature saver sub.
