Choosing between two new hydraulic gear pumps from the same GP-F20 series comes down to what your system prioritizes: flow per revolution or maximum pressure. The Dynamic Fluid Components GP-F20-16-P-A and GP-F20-08-P1-C look similar - same 11 lb. weight, same 4 × 4 × 4 in. envelope, same SAE-12 inlet and SAE-10 outlet ports - but they are tuned differently. Both are pneumatic-powered hydraulic pumps, so the real question in your hydraulics pneumatics setup is which specification matters more.
Quick verdict
If you need more fluid moved with each shaft turn, go with the GP-F20-16-P-A. If your circuit demands higher pressure capability, the GP-F20-08-P1-C is the one. Also check rotation direction, because the two spin in opposite ways.
At $204.09 and $191.62, the listed prices sit $12.47 apart, so the performance differences matter more than the price gap.
At a glance
| Spec | GP-F20-16-P-A | GP-F20-08-P1-C |
|---|---|---|
| Listed price | USD 204.09 | USD 191.62 |
| Displacement | 0.97 in³/rev (frame 16) | 0.48 in³/rev (frame 8) |
| Max pressure | 2900 psi | 3650 psi |
| Drive shaft | 5/8\" straight | 3/4\" straight |
| Rotation | Counter-clockwise | Clockwise |
| Side ported | 4.50\" | 3.95\" |
| Rear ported | 4.95\" | 4.40\" |
| Rated / max speed | 2000 / 3600 rpm | 2000 / 3600 rpm |
Where each pump wins
- GP-F20-16-P-A - wins on flow-oriented tasks. Its larger displacement per revolution moves more fluid, which is useful when you need volume.
- GP-F20-08-P1-C - wins on pressure-oriented tasks. Its higher maximum pressure rating handles more demanding circuits, and it also uses a thicker drive shaft and spins clockwise.
Product notes
#### Dynamic Fluid Components GP-F20-16-P-A Hydraulic Gear Pump (New
Choose this pump when your priority is volumetric output. The 0.97 in³/rev displacement (frame 16) is the higher of the two, so each rotation pushes more hydraulic fluid than the smaller-frame pump. That makes it a strong fit for circuits that need a lot of flow at moderate pressures. The tradeoff is a lower maximum pressure rating of 2900 psi, so it can't handle the same peaks as its sibling. It also uses a 5/8\" straight drive shaft with counter-clockwise rotation, so confirm that matches your existing shaft and spin direction. The port spacing is wider too, with a side-ported distance of 4.50\" and rear-ported distance of 4.95\", which may change how you route your hoses. If you're building or servicing a system that prioritizes volume over extreme pressure, this is the one to look at.
#### Dynamic Fluid Components GP-F20-08-P1-C Hydraulic Gear Pump (New
Pick this model when pressure is the limiting factor. Its 3650 psi maximum pressure rating is the higher between the two, giving you more headroom for demanding hydraulic applications. It also has a 3/4\" straight drive shaft and clockwise rotation, which can be a deciding factor if your setup requires a larger shaft or a CW spin. The downside is displacement: 0.48 in³/rev (frame 8) is lower, so you'll move less fluid per revolution. That makes it less ideal for high-flow circuits, but for pressure-heavy jobs it has the edge. The port spacing is more compact at 3.95\" side and 4.40\" rear, which can simplify connection layouts in tighter spaces. When your main concern is pushing against high resistance rather than moving large volumes, this pump gives you the pressure capability to do it.
Final choice by use case
For a flow-first hydraulic system where shaft rotation is counter-clockwise, the GP-F20-16-P-A is the pick. For a pressure-first system that needs up to 3650 psi and clockwise rotation, the GP-F20-08-P1-C is the pick. If both rotation and flow needs are flexible, let the difference in maximum pressure and displacement guide your call.
