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The Haskel MS-21 is a compact 1/3 HP pneumatic liquid pump featuring a robust stainless-steel body. It delivers up to 2,600 psi (179 bar) continuous hydraulic pressure using only compressed air ideal for spark-free, safe operation in hazardous locations. With a 21:1 nominal ratio ( 25:1 actual), stall-and-hold functionality, and precise 0.2 in displacement per cycle, this pump holds pressure without consuming air. Its compact size and single-air-head design make it perfect for fluid transfer, hydrostatic testing, and clamp activation in remote or industrial field environments.
- Generates up to 2,600 psi (continuous) using shop air only
- Stall-and-hold mechanism maintains pressure without further air input
- Compact 1/3 HP single-air-head design delivers precise small-volume output
- Durable stainless-steel housing and precision components ensure long-term reliability
- No need for air-line lubrication cleaner operation and lower maintenance
| Model / Part No. | MS-21 |
| Horsepower | 0.33 HP (air-driven) |
| Nominal / Actual Ratio | 21 : 1 / ~25 : 1 |
| Max Continuous Pressure | 2,600 psi (179 bar) |
| Displacement per Cycle | 0.2 in ( 3.3 mL) |
| Max Flow Rate | ~130 in /min ( 2.1 L/min) |
| Air Inlet Pressure | Up to 125 psi |
| Ports |
Inlet: 3/8" NPT Outlet: 1/4" NPT |
| Weight | 9 lb (4 kg) |