Cable Head, Top Bottom Subs, Tandems Used For Perforating Gun
There are 4 kinds of subs, Cable Head, Top Subs, Tandems, Bottom Subs and Crossovers under normal pressure and Ultra-HP. Cable Head, Top Bottom Subs, Tandems Used For Perforating Gun Description: There are kinds of subs, Cable Head, Top Subs, Tandems, Bottom Subs and Crossovers under normal pressure and Ultra-HP.