Applications:
– Guaranteed suction height of 8 meters*.
– Silicon carbide mechanical seal: 4-5 times more resistant than standard carbon ceramic mechanical seal.
– Ductile iron (FCD) for impeller & volute casing provides 10 times more erosion resistance than cast iron.
* At 0 m above sea level
The Koshin STV-50X motor pump for moderately contaminated water is characterised by low fuel consumption and a low noise level; It is designed for processing water with a maximum particle size of 8 mm; It is suitable for water supply and construction. The mechanical seal is made of silicon carbide, which significantly increases the service life of the motor pump; The robust frame facilitates transport;
Features:
- The tubular steel frame protects the motor from damage and makes the Koshin STV-50X easy to transport;
- Powerful suction power;
- Economical fuel consumption;
- Wide fuel tank neck;
- Low noise level;
- 3.6-litre fuel tank for continuous operation without refilling;
- The silicon carbide mechanical seal lasts 4-5 times longer than a conventional carbon-ceramic mechanical seal;
- Utilising the latest technology and wear-resistant materials developed in Japan;
- Long service life without loss of performance;
- Simple and easy commissioning without pre-filling the suction hose with water, simply fill the pump housing with water.
Performance Curve:

Documentation:
* This link leads to the parts list of the model STV-50X-BAA. If the complete designation of your pump model differs from this, please ask us for the correct parts list via our contact form.
Technical information:
Connection diameter | 50 mm (2″) |
Connection thread | Outer pipe thread |
Total head | 26 m (85 ft |
Delivery quantity | 580 L/min |
Max. Suction height | 8 m (26 ft) |
Grain size | Max. 8 mm |
Mechanical Seal | SiC (silicon carbide) x SiC |
Impeller & volute casing | FCD450 |
Motor type | Air-cooled 4-stroke gasoline engine |
Motor | Koshin K180 |
Cubic capacity | 179 ccm |
Rated power | 3.1 kW (4.2 hp) / 3600 rpm |
Max. Power | 3.5 kW (4.8 PS) / 3600 rpm |
Fuel | Gasoline, unleaded |
Capacity of the fuel tank | 3.6 L |
Continuous operating time | Approx. 2 hours. |
Start method | Rewind starter |
Standard accessories | 1 filter, 2 hose couplings, 3 hose clamps, 1 power tool set |
Weight, , net | 29 kg (64 lbs) |
Weight, gross | 31 kg (68.3 lbs) |
Dimensions L×W×H (cm) | 55.4 x 40 x 47.1 |
Performance:
A – Feed,
B – head,
C – Suction

*Performance may vary depending on conditions