● Hollow plunger allows for both push and pull forces. ● Nickel plated floating center tube increases product life. ● Baked enamel finish for increased corrosion resistance. ● Collar threads enable easy fixing. ● Relief valves prevent damage in case of over pressurization. ● ECR-400 coupler and dust cap included with all models. ● Plunger wiper reduces contamination extending cylinder.