Samson Corporation 340120 PM4 3:1 Stub Pump w/ Bung Adaptor
- Part #:340120
- Model #:PumpMaster4
- Condition:Brand New

Overview
This efficient and versatile lubricant dispensing solution, the Samson Corporation 340120 PumpMaster4 3:1 Stub Pump with Bung Adaptor, is designed for medium-sized operations requiring reliable lubricant distribution. This air-operated, double-acting oil pump delivers high-volume output for a variety of fluids, including synthetic and mineral-based oils, gear lubes, hydraulic oils, and transmission fluids. The included adjustable 2" NPT bung adapter ensures compatibility with various drums and tanks, simplifying setup. A built-in port is available for an optional pressure relief valve (PN 609 007). Ideal for auto dealers, service shops, fleet service, lube trucks, mining, construction, and in-plant use, the PumpMaster4 enhances productivity and reduces downtime.
Key Features
- 3:1 Pump Ratio: Provides high-volume output for efficient lubricant dispensing.
- Double-Acting Design: Ensures smooth and consistent flow for efficient operation.
- Adjustable 2" NPT Bung Adapter: Offers versatile compatibility with drums and tanks.
- Pressure Relief Valve Port: Built-in port for optional pressure relief valve (PN 609 007) for added safety.
- Durable Construction: Designed to withstand the demands of industrial environments.
Specifications
Brand: Samson
Model: 340120 PumpMaster4
Pump Ratio: 3:1
Operation: Air Operated
Bung Adapter: 2" NPT (M), height adjustable
Pressure Relief Valve: Optional (PN 609 007)
Fluids Handled: Synthetic and mineral-based oils, gear lube, hydraulic oil, transmission fluid
Ideal For: Auto dealers, service shops, fleet service, lube trucks, mining, construction, in-plant use
Applications
Ideal for professional technicians and maintenance personnel in auto dealerships, service shops, fleet service centers, lube trucks, mining operations, construction sites, and in-plant industrial settings. Suitable for medium-sized operations requiring efficient and high-volume dispensing of various lubricants. Essential for maintaining equipment, reducing downtime, and improving productivity in demanding environments.
Performance and Characteristics
The Samson 340120 PumpMaster4 3:1 Stub Pump delivers efficient and high-volume lubricant dispensing with its 3:1 pump ratio and double-acting design. This design ensures a smooth and consistent flow, maximizing productivity. The adjustable 2" NPT bung adapter offers versatile compatibility with various drums and tanks. The built-in port for an optional pressure relief valve enhances safety. Built for durability, this pump is designed to withstand the rigors of industrial use.
Additional Information
This PumpMaster4 pump is engineered to provide efficient and reliable lubricant dispensing in medium-sized industrial operations. The 3:1 pump ratio ensures high-volume output, and the double-acting design delivers a smooth, consistent flow. The adjustable bung adapter simplifies installation, and the availability of an optional pressure relief valve adds an extra layer of safety. The durable construction makes this pump a valuable asset for professionals needing a robust and versatile lubricant dispensing solution.
Optimize your lubricant dispensing operations with the Samson 340120 PumpMaster4. Shop Now!

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Pump Pressure Ratio | 3:1 |
Air Pressure Operating Range | 20-140 psi (1.5-10 bar) |
Air Consumption | 10 scfm (285 NL/min) Air consumption with 90 psi (6 bar) air inlet pressure and 85 cycles per minute. |
Maximum Fluid Outlet Pressure | 420 psi (30 bar) |
Air Motor Diameter | 3 1/2" (88 mm) |
Air Motor Effective Diameter | 2 1/2" (60 mm) |
Air Motor Stroke | 4" (100 mm) |
Delivery at 235 cpm | 6.5 gpm (24.6 l/min) |
Maximum Free Flow Delivery | 11.1 gpm (42 l/min) Maximum free delivery at 100 psi (7 bar). |
Air inlet | 3/8" NPT(F) |
Fluid inlet(stub pump only) | 1" NPT(F) |
Fluid outlet | 3/4" NPT(F) |
Wetted Materials | Aluminum / Steel / Polyurethane / NBR / PTFE |
Noise Level | Pump noise level meets OSHA requirements at all recommended operating air pressures |
Overall Length | 23" (585) |
Weight | 13 lb (5,7 kg) |
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