The EP-100WD is a 100 Ton compression head for full tension, transmission and substation connections and requires an external 10,000 psi, double-acting pumping source. The EP-100WD is even lighter than our previous model, the EP-100WC, by a full 18 pounds.; The EP-100WD will accept shell-type dies currently used with Alcoa 100 ton compression heads. This double acting compression head is designed to operate from Huskie Tools pump models R-14EAD, HPG-4 or any 3/4 HP high-pressure, double-acting pump with the proper oil capacity.; Double acting means hydraulically advancing the ram to build proper tonnage, then the hydraulic pressure is reversed to retract the ram. This will eliminate all possibilities of the connector hanging up or the tool jamming.