Cylinders Describe the product sizes, including different SKUs different sizes. SSA means that the rod is a PORT air intake in the cylinder block Extend the gas pole, the off-gas spring causes the pole to retract Match 3V210-08 series two-position three-way solenoid valve or 3H210-08 manual valve STA means that the rod has been ejected by the spring, and the rod retracts into the cylinder after the PORT is in the air.Cylinders.