The best way to keep your Gemini compressor performing to its full potential is with O.E.M. Cooper parts designed specifically for the job. With decades of engineering, manufacturing, and in-field experience in material wear and customer demand patterns, our parts inventory system is designed to reflect and respond to the real needs of modern operating conditions. Whether you have a current Gemini model or one of our legacy brands, we’ll have all the parts you need when you need them.
| Model | Number of Throws | Rated Speed (rpm) | Rated Power (bhp) | Stroke (in) | Rod Diam (in) | Con Rod Length (in) | Compression Rod Load (lbf) |
|---|---|---|---|---|---|---|---|
| A351 | 1 | 1800 | 200.0 | 3.500 | 1.375 | 8.380 | 14500.0 |
| A352 | 2 | 1800 | 400.0 | 3.500 | 1.375 | 8.380 | 14500.0 |
| A354 | 4 | 1800 | 800.0 | 3.500 | 1.375 | 8.380 | 14500.0 |
| B352 | 2 | 1800 | 600.0 | 3.500 | 1.750 | 12.000 | 25000.0 |
| B354 | 4 | 1800 | 1200.0 | 3.500 | 1.750 | 13.250 | 25000.0 |
| B452 | 2 | 1500 | 700.0 | 4.500 | 2.000 | 12.000 | 30000.0 |
| B454 | 4 | 1500 | 1400.0 | 4.500 | 2.000 | 13.250 | 30000.0 |
| B502 | 2 | 1200 | 800.0 | 5.000 | 2.000 | 12.000 | 30000.0 |
| B504 | 4 | 1200 | 1600.0 | 5.000 | 2.000 | 13.250 | 30000.0 |
| BJD | 2 | 1800 | 600.0 | 3.500 | 1.750 | 12.000 | 20000.0 |
| BKD | 2 | 1200 | 800.0 | 5.000 | 2.000 | 13.250 | 30000.0 |
| BKDD | 4 | 1200 | 1600.0 | 5.000 | 2.000 | 13.250 | 30000.0 |
| BRD | 2 | 1500 | 700.0 | 4.500 | 2.000 | 13.250 | 25000.0 |
| D422 | 2 | 1600 | 1200.0 | 4.250 | 1.500 | 14.500 | 22000.0 |
| D424 | 4 | 1600 | 2400.0 | 4.250 | 1.500 | 14.500 | 22000.0 |
| D502 | 2 | 1500 | 1200.0 | 5.000 | 2.000 | 14.500 | 32500.0 |
| D504 | 4 | 1500 | 2400.0 | 5.000 | 2.000 | 14.500 | 32500.0 |
| D602 | 2 | 1200 | 1200.0 | 6.000 | 2.000 | 14.500 | 32500.0 |
| D604 | 4 | 1200 | 2400.0 | 6.000 | 2.000 | 14.500 | 32500.0 |
| DS502 | 2 | 1500 | 1200.0 | 5.000 | 2.000 | 14.500 | 35000.0 |
| DS504 | 4 | 1500 | 2400.0 | 5.000 | 2.000 | 14.500 | 35000.0 |
| DS602 | 2 | 1200 | 1200.0 | 6.000 | 2.000 | 14.500 | 35000.0 |
| DS604 | 4 | 1200 | 2400.0 | 6.000 | 2.000 | 14.500 | 35000.0 |
| E502 | 2 | 1500 | 2400.0 | 5.000 | 2.250 | 18.000 | 47500.0 |
| E504 | 4 | 1500 | 4800.0 | 5.000 | 2.250 | 18.000 | 47500.0 |
| E506 | 6 | 1500 | 7200.0 | 5.000 | 2.250 | 18.000 | 47500.0 |
| E602 | 2 | 1200 | 2400.0 | 6.000 | 2.250 | 18.000 | 47500.0 |
| E604 | 4 | 1200 | 4800.0 | 6.000 | 2.250 | 18.000 | 47500.0 |
| E606 | 6 | 1200 | 7200.0 | 6.000 | 2.250 | 18.000 | 47500.0 |
| E702 | 2 | 1000 | 2400.0 | 7.000 | 2.250 | 18.000 | 47500.0 |
| E704 | 4 | 1000 | 4800.0 | 7.000 | 2.250 | 18.000 | 47500.0 |
| E706 | 6 | 1000 | 7200.0 | 7.000 | 2.250 | 18.000 | 47500.0 |
| ES502 | 2 | 1500 | 2400.0 | 5.000 | 2.250 | 18.000 | 50000.0 |
| ES504 | 4 | 1500 | 4800.0 | 5.000 | 2.250 | 18.000 | 50000.0 |
| ES506 | 6 | 1500 | 7200.0 | 5.000 | 2.250 | 18.000 | 50000.0 |
| ES602 | 2 | 1200 | 2400.0 | 6.000 | 2.250 | 18.000 | 50000.0 |
| ES604 | 4 | 1200 | 4800.0 | 6.000 | 2.250 | 18.000 | 50000.0 |
| ES606 | 6 | 1200 | 7200.0 | 6.000 | 2.250 | 18.000 | 50000.0 |
| ES702 | 2 | 1000 | 2400.0 | 7.000 | 2.250 | 18.000 | 50000.0 |
| ES704 | 4 | 1000 | 4800.0 | 7.000 | 2.250 | 18.000 | 50000.0 |
| ES706 | 6 | 1000 | 7200.0 | 7.000 | 2.250 | 18.000 | 50000.0 |
| F502 | 2 | 1500 | 2400.0 | 5.000 | 2.500 | 18.000 | 60000.0 |
| F504 | 4 | 1500 | 4800.0 | 5.000 | 2.500 | 18.000 | 60000.0 |
| F506 | 6 | 1500 | 7200.0 | 5.000 | 2.500 | 18.000 | 60000.0 |
| F602 | 2 | 1200 | 2400.0 | 6.000 | 2.500 | 18.000 | 60000.0 |
| F604 | 4 | 1200 | 4800.0 | 6.000 | 2.500 | 18.000 | 60000.0 |
| F606 | 6 | 1200 | 7200.0 | 6.000 | 2.500 | 18.000 | 60000.0 |
| F702 | 2 | 1000 | 2400.0 | 7.000 | 2.500 | 18.000 | 60000.0 |
| F704 | 4 | 1000 | 4800.0 | 7.000 | 2.500 | 18.000 | 60000.0 |
| F706 | 6 | 1000 | 7200.0 | 7.000 | 2.500 | 18.000 | 60000.0 |
| FE332A-2 | 2 | 1400 | 250.0 | 3.500 | 1.375 | 8.375 | 10000.0 |
| FE332A-4 | 4 | 1400 | 500.0 | 3.500 | 1.375 | 8.375 | 10000.0 |
| FE332B-2 | 2 | 1400 | 250.0 | 3.500 | 1.375 | 8.375 | 10000.0 |
| FE332C-2 | 2 | 1600 | 300.0 | 3.500 | 1.375 | 8.375 | 12000.0 |
| FE332D-2 | 2 | 1800 | 400.0 | 3.500 | 1.375 | 8.375 | 14500.0 |
| FE332D-4 | 4 | 1800 | 800.0 | 3.500 | 1.375 | 8.375 | 14500.0 |
| FE450A-2 | 2 | 1400 | 550.0 | 4.250 | 1.500 | 14.500 | 18000.0 |
| FE450A-4 | 4 | 1400 | 1100.0 | 4.250 | 1.500 | 14.500 | 18000.0 |
| FE450B-2 | 2 | 1500 | 1200.0 | 4.250 | 1.500 | 14.500 | 18000.0 |
| FE450B-4 | 4 | 1500 | 2400.0 | 4.250 | 1.500 | 14.500 | 18000.0 |
| FE450C-2 | 2 | 1600 | 1200.0 | 4.250 | 1.500 | 14.500 | 22000.0 |
| FE450C-4 | 4 | 1600 | 2400.0 | 4.250 | 1.500 | 14.500 | 22000.0 |
| FE550A-2 | 2 | 1200 | 550.0 | 5.000 | 2.000 | 14.500 | 25000.0 |
| FE550A-4 | 4 | 1200 | 1100.0 | 5.000 | 2.000 | 14.500 | 25000.0 |
| FE550B-2 | 2 | 1200 | 550.0 | 5.000 | 2.000 | 14.500 | 25000.0 |
| FE550B-4 | 4 | 1200 | 1100.0 | 5.000 | 2.000 | 14.500 | 25000.0 |
| FE550C-2 | 2 | 1500 | 1200.0 | 5.000 | 2.000 | 14.500 | 30000.0 |
| FE550C-4 | 4 | 1500 | 2400.0 | 5.000 | 2.000 | 14.500 | 30000.0 |
| FE550D-2 | 2 | 1500 | 1200.0 | 5.000 | 2.000 | 14.500 | 32500.0 |
| FE550D-4 | 4 | 1500 | 2400.0 | 5.000 | 2.000 | 14.500 | 32500.0 |
| FE565A-2 | 2 | 1200 | 1200.0 | 5.000 | 2.250 | 18.000 | 40000.0 |
| FE565A-4 | 4 | 1200 | 2400.0 | 5.000 | 2.250 | 18.000 | 40000.0 |
| FE565A-6 | 6 | 1200 | 7200.0 | 5.000 | 2.250 | 18.000 | 40000.0 |
| FE565B-2 | 2 | 1200 | 1200.0 | 5.000 | 2.250 | 18.000 | 40000.0 |
| FE565B-4 | 4 | 1200 | 2400.0 | 5.000 | 2.250 | 18.000 | 40000.0 |
| FE565B-6 | 6 | 1200 | 7200.0 | 5.000 | 2.250 | 18.000 | 40000.0 |
| FE565C-2 | 2 | 1500 | 2400.0 | 5.000 | 2.250 | 18.000 | 47500.0 |
| FE565C-4 | 4 | 1500 | 4800.0 | 5.000 | 2.250 | 18.000 | 47500.0 |
| FE565C-6 | 6 | 1500 | 7200.0 | 5.000 | 2.250 | 18.000 | 47500.0 |
| FE565DH-2 | 2 | 1500 | 2400.0 | 5.000 | 2.500 | 18.000 | 60000.0 |
| FE565DH-4 | 4 | 1500 | 4800.0 | 5.000 | 2.500 | 18.000 | 60000.0 |
| FE565DH-6 | 6 | 1500 | 7200.0 | 5.000 | 2.500 | 18.000 | 60000.0 |
| FE650A-2 | 2 | 1000 | 550.0 | 6.000 | 2.000 | 14.500 | 25000.0 |
| FE650A-4 | 4 | 1000 | 1100.0 | 6.000 | 2.000 | 14.500 | 25000.0 |
| FE650B-2 | 2 | 1000 | 550.0 | 6.000 | 2.000 | 14.500 | 25000.0 |
| FE650B-4 | 4 | 1000 | 1100.0 | 6.000 | 2.000 | 14.500 | 25000.0 |
| FE650C-2 | 2 | 1200 | 1200.0 | 6.000 | 2.000 | 14.500 | 30000.0 |
| FE650C-4 | 4 | 1200 | 2400.0 | 6.000 | 2.000 | 14.500 | 30000.0 |
| FE650D-2 | 2 | 1200 | 1200.0 | 6.000 | 2.000 | 14.500 | 32500.0 |
| FE650D-4 | 4 | 1200 | 2400.0 | 6.000 | 2.000 | 14.500 | 32500.0 |
| FE665A-2 | 2 | 1000 | 1200.0 | 6.000 | 2.250 | 18.000 | 40000.0 |
| FE665A-4 | 4 | 1000 | 2400.0 | 6.000 | 2.250 | 18.000 | 40000.0 |
| FE665A-6 | 6 | 1000 | 7200.0 | 6.000 | 2.250 | 18.000 | 40000.0 |
| FE665B-2 | 2 | 1000 | 2400.0 | 6.000 | 2.250 | 18.000 | 40000.0 |
| FE665B-4 | 4 | 1000 | 4800.0 | 6.000 | 2.250 | 18.000 | 40000.0 |
| FE665B-6 | 6 | 1000 | 7200.0 | 6.000 | 2.250 | 18.000 | 40000.0 |
| FE665C-2 | 2 | 1200 | 2400.0 | 6.000 | 2.250 | 18.000 | 47500.0 |
| FE665C-4 | 4 | 1200 | 4800.0 | 6.000 | 2.250 | 18.000 | 47500.0 |
| FE665C-6 | 6 | 1200 | 7200.0 | 6.000 | 2.250 | 18.000 | 47500.0 |
| FE665DH-2 | 2 | 1200 | 2400.0 | 6.000 | 2.500 | 18.000 | 60000.0 |
| FE665DH-4 | 4 | 1200 | 4800.0 | 6.000 | 2.500 | 18.000 | 60000.0 |
| FE665DH-6 | 6 | 1200 | 7200.0 | 6.000 | 2.500 | 18.000 | 60000.0 |
| FE765B-2 | 2 | 1000 | 2400.0 | 7.000 | 2.250 | 18.000 | 40000.0 |
| FE765B-4 | 4 | 1000 | 4800.0 | 7.000 | 2.250 | 18.000 | 40000.0 |
| FE765B-6 | 6 | 1000 | 7200.0 | 7.000 | 2.250 | 18.000 | 40000.0 |
| FE765C-2 | 2 | 1000 | 2400.0 | 7.000 | 2.250 | 18.000 | 47500.0 |
| FE765C-4 | 4 | 1000 | 4800.0 | 7.000 | 2.250 | 18.000 | 47500.0 |
| FE765C-6 | 6 | 1000 | 7200.0 | 7.000 | 2.250 | 18.000 | 47500.0 |
| FE765DH-2 | 2 | 1000 | 2400.0 | 7.000 | 2.500 | 18.000 | 60000.0 |
| FE765DH-4 | 4 | 1000 | 4800.0 | 7.000 | 2.500 | 18.000 | 60000.0 |
| FE765DH-6 | 6 | 1000 | 7200.0 | 7.000 | 2.500 | 18.000 | 60000.0 |
| FS502 | 2 | 1500 | 2400.0 | 5.000 | 2.500 | 18.000 | 60000.0 |
| FS504 | 4 | 1500 | 4800.0 | 5.000 | 2.500 | 18.000 | 60000.0 |
| FS506 | 6 | 1500 | 7200.0 | 5.000 | 2.500 | 18.000 | 60000.0 |
| FS602 | 2 | 1200 | 2400.0 | 6.000 | 2.500 | 18.000 | 60000.0 |
| FS604 | 4 | 1200 | 4800.0 | 6.000 | 2.500 | 18.000 | 60000.0 |
| FS606 | 6 | 1200 | 7200.0 | 6.000 | 2.500 | 18.000 | 60000.0 |
| FS702 | 2 | 1000 | 2400.0 | 7.000 | 2.500 | 18.000 | 60000.0 |
| FS704 | 4 | 1000 | 4800.0 | 7.000 | 2.500 | 18.000 | 60000.0 |
| FS706 | 6 | 1000 | 7200.0 | 7.000 | 2.500 | 18.000 | 60000.0 |
| H301 | 1 | 1800 | 100.0 | 3.000 | 1.125 | 8.500 | 10000.0 |
| H302 | 2 | 1800 | 200.0 | 3.000 | 1.125 | 8.500 | 10000.0 |
| H304 | 4 | 1800 | 400.0 | 3.000 | 1.125 | 8.500 | 10000.0 |
| HPD | 2 | 1800 | 200.0 | 3.000 | 1.125 | 8.500 | 10000.0 |
| HPDB | 1 | 1800 | 100.0 | 3.000 | 1.125 | 8.500 | 10000.0 |
| HPDD | 4 | 1800 | 400.0 | 3.000 | 1.125 | 8.500 | 10000.0 |
| HPDS | 2 | 1800 | 200.0 | 3.000 | 1.125 | 8.500 | 10000.0 |
| HPSS | 2 | 1800 | 200.0 | 3.000 | 1.125 | 8.500 | 10000.0 |
| M301 | 1 | 1800 | 60.0 | 3.000 | 1.125 | 8.000 | 6000.0 |
| M302 | 2 | 1800 | 120.0 | 3.000 | 1.125 | 8.000 | 6000.0 |
| MOC | 2 | 1800 | 120.0 | 3.000 | 0.000 | 8.000 | 6000.0 |
| MPC | 2 | 1800 | 120.0 | 3.000 | 0.000 | 8.000 | 6000.0 |
| MPD | 2 | 1800 | 120.0 | 3.000 | 1.125 | 8.000 | 6000.0 |
| MPDB | 1 | 1800 | 60.0 | 3.000 | 1.125 | 8.000 | 6000.0 |
| MPDS | 2 | 1800 | 120.0 | 3.000 | 1.125 | 8.000 | 6000.0 |
| MPSB | 1 | 1800 | 60.0 | 3.000 | 1.125 | 8.000 | 6000.0 |
| MPSS | 2 | 1800 | 120.0 | 3.000 | 1.125 | 8.000 | 6000.0 |
