another two inches and this position is marked this position designates the top of the compression stroke after the top of the compression stroke has been determined a hardened polish rod 40 is coupled to the rod string 38 and a pump jack not shown is secured to the hardened polish rod 40 the remaining conventional oil well components can then be assembled these components include but are not limited to a stuffing box 46 which maintains pressure within the high pressure tubing 29 and through which the hardened polish rod 40 passes a high pressure tubing pressure gauge 48 and its corresponding high pressure valve 50 which allow the pressure inside the high pressure tubing 29 to be monitored a casing pressure gauge 52 and its corresponding high pressure valve 54 which allow the pressure inside the casing 18 to be monitored a fifty five gallon water drum 56 a 3 4 34 copper feeder pipe 58 a 3 4 34 union 60 a make up water feeder 62 a water make up valve 64 and a relief valve 66 next the pump jack is turned on and therefore starts to actuate the hardened polish rod 40 the rod string 38 and the compression cylinder 36 during the first few strokes of the pump jack the union 60 is generally loosened and the water make up valve 64 is turned into an inverted position thus the first few strokes of the pump jack force all of the air out of the system this is very important since air is a very compressible medium the presence of air inside the high pressure tubing 29 is extremely detrimental and prohibits the system from generating sufficient pressure within the high pressure tubing 29 after.