OTC Tools OTC 4180 17 1/2-Ton Power Twin Hydraulic Ram and Pump Set. Center-hole feature permits extending jacking screws, cables, puller screws, etc. straight through the ram. This spring return unit is compact & lightweight and is ideal for jobs having restricted work space. Set includes OTC4120 17 1/2-ton, 2" stroke single-acting hydraulic ram, OTC4002 pump, OTC9650 gauge, OTC24815 tee, OTC9767 hose, and OTC9798 hose half coupler. Specifications: Capacity Tons: 17 1/2; Stroke: 2"; Spring Return: yes; Height Collapsed: 6-7/8".