DP-2A : DP-1B Pump and head is the same, besides large capacity of oil, able to use with bigger capacity larger ram also.
DP-1B : This is automatic double plunger pump. It makes faster speed of ram at back up with lot of amount of oil.
DP-1A : As small light weight pump, use to light duty tools like as hole punch, cable cutter etc.
* Specification
| 
 Model  | 
 Type  | 
 Pressure  | 
 Pisiton Dia (ã)  | 
 Piston  | 
 Ouptut per stroke  | 
 Reservoir  | 
 Overall  | 
 Weight  | 
||
| 
 High  | 
 Low  | 
 High  | 
 Low  | 
|||||||
| 
 DP-1A  | 
 Hand  | 
 700  | 
 10  | 
 
  | 
 20.5  | 
 3.9  | 
 
  | 
 300  | 
 360  | 
 4.0  | 
| 
 DP-1B  | 
 "  | 
 "  | 
 12  | 
 28.5  | 
 20.5  | 
 2.3  | 
 13.0  | 
 800  | 
 520  | 
 8.0  | 
| 
 DP-2A  | 
 "  | 
 "  | 
 "  | 
 "  | 
 "  | 
 "  | 
 "  | 
 2,000  | 
 580  | 
 13.6  | 
| 
 DP-2B  | 
 "  | 
 "  | 
 12.7  | 
 44.2  | 
 20.5  | 
 2.6  | 
 31.0  | 
 2,300  | 
 610  | 
 20.6  | 
| 
 DP-3A  | 
 "  | 
 "  | 
 "  | 
 "  | 
 "  | 
 "  | 
 "  | 
 3,000  | 
 760  | 
 22  | 
| 
 DP-3B  | 
 "  | 
 "  | 
 18  | 
 57  | 
 35  | 
 9.0  | 
 90.0  | 
 10,000  | 
 850  | 
 50.0  |