Saylor-Beall K-Series industrial air compressor pump, removed from service during a compressor upgrade. During troubleshooting prior to replacement, the pump was not building pressure properly. Based on observed symptoms, internal valve issues were suspected, however no teardown or rebuild was performed, and the exact cause has not been confirmed. Model: KMT 6 V23. Series: K (industrial duty). Construction: Heavy cast iron. Condition: Turns freely by hand. ? What Is Known. No visible cracks in block or head. Heavy-duty, rebuildable industrial design. What Is Not Known / Not Guaranteed. Please review pictures as this is the exact pump you will receive. Package will be packaged securely. Thank you for checking out my listing God bless.