| 421AK00540C | NO CONTROL SPECIAL FEATURES | THIRD DESIGN | 80.0 cm3/r [4.88 in3/r] | 199.9-206.8 bar [2900-3000 lbf/in2] | NO PUMP SPECIAL FEATURES |
| 421AK00539C | BLEED DOWN ORIFICE | THIRD DESIGN | 80.0 cm3/r [4.88 in3/r] | 199.9-206.8 bar [2900-3000 lbf/in2] | NO PUMP SPECIAL FEATURES |
| 421AK00538C | NO CONTROL SPECIAL FEATURES | THIRD DESIGN | 80.0 cm3/r [4.88 in3/r] | 199.9-206.8 bar [2900-3000 lbf/in2] | NO PUMP SPECIAL FEATURES |
| 421AK00536C | NO CONTROL SPECIAL FEATURES | THIRD DESIGN | 80.0 cm3/r [4.88 in3/r] | 199.9-206.8 bar [2900-3000 lbf/in2] | NO PUMP SPECIAL FEATURES |
| 421AK00535C | BLEED DOWN ORIFICE | THIRD DESIGN | 62.3 cm3/r [3.80 in3/r] | 241.3-248.2 bar [3500-3600 lbf/in2] | NO PUMP SPECIAL FEATURES |
| 421AK00533C | NO CONTROL SPECIAL FEATURES | THIRD DESIGN | 62.3 cm3/r [3.80 in3/r] | 241.3-248.2 bar [3500-3600 lbf/in2] | NO PUMP SPECIAL FEATURES |
| 421AK00533B | NO CONTROL SPECIAL FEATURES | Second Design | 62.3 cm3/r [3.80 in3/r] | 241.3-248.2 bar [3500-3600 lbf/in2] | NO PUMP SPECIAL FEATURES |
| 421AK00519B | BLEED DOWN ORIFICE | Second Design | 80.0 cm3/r [4.88 in3/r] | 199.9-206.8 bar [2900-3000 lbf/in2] | AUXILIARY MOUNTING COVER PLATE |
| 421AK00517C | BLEED DOWN ORIFICE | THIRD DESIGN | 80.0 cm3/r [4.88 in3/r] | 199.9-206.8 bar [2900-3000 lbf/in2] | AUXILIARY MOUNTING COVER PLATE |
| 421AK00514C | NO CONTROL SPECIAL FEATURES | THIRD DESIGN | 80.0 cm3/r [4.88 in3/r] | 199.9-206.8 bar [2900-3000 lbf/in2] | AUXILIARY MOUNTING COVER PLATE |
| 421AK00509C | NO CONTROL SPECIAL FEATURES | THIRD DESIGN | 62.3 cm3/r [3.80 in3/r] | 241.3-248.2 bar [3500-3600 lbf/in2] | AUXILIARY MOUNTING COVER PLATE |
| 421AK00503C | BLEED DOWN ORIFICE | THIRD DESIGN | 62.3 cm3/r [3.80 in3/r] | 241.3-248.2 bar [3500-3600 lbf/in2] | AUXILIARY MOUNTING COVER PLATE |
| 421AK00495B | BLEED DOWN ORIFICE | Second Design | 80.0 cm3/r [4.88 in3/r] | 199.9-206.8 bar [2900-3000 lbf/in2] | NO PUMP SPECIAL FEATURES |
| 421AK00494C | NO CONTROL SPECIAL FEATURES | THIRD DESIGN | 80.0 cm3/r [4.88 in3/r] | 199.9-206.8 bar [2900-3000 lbf/in2] | NO PUMP SPECIAL FEATURES |