OTC (4180 Power Twin Ram and Pump Set - 17-1/2 Ton Center-hole feature that permits extending adjusting screws, cables, puller screws, etc., straight through the ram This spring return unit is compact and lightweight Ideal for jobs having restricted working space Set includes OTC 4120 17-1/2 ton 2 inch stroke single-acting hydraulic ram, OTC 4002 pump. OTC 9650 gauge, OTC 24815 tee, OTC 9767 hose, and OTC 9798 hose half coupler