For RPR Non Locking Gas Spring operational working you need to apply External force on gas spring.Push on a gas spring and you force the piston rod and piston into the cylinder and this compresses the gas inside the cylinder. In other words, when a gas spring is fully pushed in, you've compressed the gas inside by an amount equal to the volume of the piston rod. and When you release the External force applied on Gas spring. Gas spring Piston rod return to its Original Position.