Compatible Machines for Graco 17J877 Inlet Housing Kit
| Machine Model | Machine Type |
| Graco Magnum ProX21 Electric TrueAirless Sprayer (Stand) | Airless Paint Sprayer |
| Graco Magnum ProX21 Electric TrueAirless Sprayer (Cart) | Airless Paint Sprayer |
The Graco 17J877 Inlet Housing Kit is a genuine OEM replacement part designed specifically for the Graco ProX21 series airless paint sprayers. It helps restore strong suction, reliable priming, and consistent fluid flow by preventing air leaks at the pump inlet. Precision-machined components ensure a tight seal and long-term durability in demanding jobsite conditions.
What’s Included in the 17J877 Kit
- Aluminum inlet housing body designed for direct ProX21 fitment
- Hardened stainless steel check ball and seat for consistent sealing
- Nitrile O-ring with PTFE back-up ring for chemical and wear resistance
- Spring and retainer components required for proper inlet valve operation
Key Benefits of the 17J877 Inlet Housing Kit
- Improves priming performance by restoring proper inlet suction
- Reduces pump wear by preventing air entry into the fluid section
- Built for tough coatings including latex, enamels, and high-solids materials
- Maintains manufacturer warranty when using genuine Graco replacement parts
Installation Tips
Always relieve system pressure and flush the sprayer before installation. Remove the existing inlet housing, clean the pump threads, apply fresh PTFE tape, and torque the new inlet housing according to Graco specifications. After installation, prime the sprayer to confirm smooth, bubble-free material flow.
Frequently Asked Questions
This kit helps resolve common issues such as slow or failed priming, air bubbles in the suction tube, loss of pressure, and inconsistent spray patterns caused by worn inlet components.
No. The 17J877 inlet housing kit is designed specifically for ProX21 models. Other ProX sprayers such as the ProX17 or ProX19 use different inlet housing assemblies.
No additional parts are required. The kit is a direct replacement and installs directly into the ProX21 pump assembly.
