Built with grey cast iron, bronze, and stainless steel for long life. 2. Maintenance and Rebuild Guide
(often interchangeable with the Beatty B-251 or Pompco S-275) is designed for high-pressure, consistent water delivery. Double-action piston, single cylinder.
| Connection | Requirement | Consequence if Ignored | | :--- | :--- | :--- | | | Flooded suction or positive head of 3-10 feet | Cavitation, damaged plungers | | Inlet Hose | 3/4” minimum, reinforced, no kinks | Starvation, pressure fluctuation | | Outlet (Discharge) | High-pressure hose rated for 3000+ PSI | Burst hazard | | Unloader Valve | Must be installed on outlet side | Pump will overheat and explode | duro k255 piston pump manual
If you see oil leaking from the front of the pump (behind the manifold), the high-pressure seals or drainback line is compromised.
Whether you have inherited an old system, found a unit at an auction, or are troubleshooting a loss of pressure, finding the correct information is critical. This comprehensive article serves as your definitive resource for the . We will break down the specifications, walk you through installation, create a troubleshooting guide, and detail the maintenance procedures required to keep this vintage iron running for years to come. Built with grey cast iron, bronze, and stainless
A unique feature of many Duro K255 manuals is the inclusion of an "Air Compressor" mode. These pumps were versatile enough to be used as air compressors for service stations or tire inflation.
Counterfeit Duro parts are common. The manual advises: Always purchase from an authorized distributor and verify the holographic seal on the parts bag. Double-action piston, single cylinder
Replace these if the pump is "sloshing" water without building pressure.
Most issues with the Duro K255 occur in the "wet end," where water is actively moved. You can find complete rebuild kits at retailers like Home Hardware or specialized suppliers like Industrial Pump Parts .
Priming capability up to 25 feet (7.62 m). Safety Features: Includes a 100 PSI safety relief valve.