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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) |