For sale is a Parker, Single Acting Air Cylinder, No. 0.56PSR01.00.  The cylinder is brand new and unused.  I have several available so if you buy more than one, shipping is reduced on the additional units.  The first seven to sell are in the factory sealed plastic bag.  The eighth to sell will be the exact one used for the pictures.  The cylinder(s) will be shipped promptly from Missouri.  Thanks for looking.