

Visual inspection sightglass designed for Graco I6, I10, I16, H10, and H16 pump assemblies, allowing real-time monitoring of lubrication and internal fluid flow to support safe and efficient operation.
| Compatible Pump Series | Typical Machine/Application |
|---|---|
| Graco I6 | Airless sprayers using I-Series lower pump assemblies |
| Graco I10 | Medium-duty professional Graco airless paint sprayers |
| Graco I16 | Heavy-duty contractor-grade airless spray equipment |
| Graco H10 | High-output hydraulic/contractor spray systems |
| Graco H16 | Industrial-grade Graco sprayers with H-Series pump configuration |
The Graco 17C521 Sightglass is a precision inspection component designed for use in I6, I10, I16, H10, and H16 pump systems. It functions as a visual monitoring window within the pump assembly, allowing technicians and operators to quickly check fluid movement, lubrication flow, and internal condition without disassembling the unit.
Built for durability in demanding spraying environments, the sightglass helps maintain optimal pump performance by enabling early detection of irregular flow patterns, air entrapment, or lubrication issues. This reduces downtime and supports consistent spray quality in professional airless painting applications.