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By certification 
Single-acting Hollow Plunger Cylinders
Hollow Plunger Cylinders
Hollow plunger design allows for both pull and push forces
Singer-acting, spring return
Nickel-plated, floating centre tube on models over 20 ton
increases product life.
Baked enamel finish for increased corrosion resistance
Collar threads for easy fixture
RCH-120 has 1/4" NPT oil port and includes AR-630 coupler
RCH-121 and RCH-1211 have FZ-1630 coupler and AR-630
quick coupler, other models have CR-400 coupler.
