an inventive piston chamber assembly 10 piston chamber assembly 10 has piston 18 and chamber 14 defined by cylinder 12 piston 18 has first side 22 and second side 26 on first side 22 of piston 18 there is provided first inlet 30 that permits the passage of air from compressor 13 through line 17 onto first side 22 of piston 18 in addition piston chamber assembly 10 has second inlet 34 which permits air from compressor 13 through line 19 to pass onto second side 26 of piston 18 here piston 18 is attached to rod 16 which may be attached to a test piece in contrast to conventional designs piston chamber assembly 10 has actuator 38 disposed within chamber 14 actuator 38 has body 50 which has first portion 54 on first side of piston 18 and second portion 58 on second side 26 of piston 18 first portion 54 and second portion 58 are slideably received within chamber 14 in addition first portion 54 and second portion 58 are connected by rods 21 so that they may slide together within chamber 14 piston 18 is also slideably received on rods 21 between first portion 54 and second portion 58 piston 18 further has seal 20 here an o ring that serves to wipe chamber 14 as well as to provide a seal between first side 22 and second side 26 of piston 18 piston chamber assembly 10 further has exhaust outlet 28 on first side 22 of piston 18 and exhaust outlet 29 on second side 26 of piston 18 exhaust outlet 29 is merely a gap between.