Stop Pressure Spikes. Stop Downtime.

When an unloader starts sticking, surging, or leaking, your entire rig becomes unreliable.
The AR21040 bolt on unloader with chemical injector is built for contractors running up to 2600 PSI who need stable pressure control under real working conditions — not homeowner duty cycles.

Designed for commercial triplex pump systems and daily use.

⚙️ Key Specifications

• Model: AR21040
• Maximum Pressure: 2600 PSI
• Maximum Flow Rate: 3-4 GPM
• Inlet Port: 1/2" BSP-F
• Outlet Port: 3/8" BSP-M
• Bypass Port: Internal
• Adjustment Type: Knob
• Material: Brass / Forged Brass / Stainless components
• Manufacturer: AR Pumps

This is the type of unloader you run on:

• Truck-mounted rigs
• Trailer skid units
• Flatwork & building wash systems
• Fleet wash setups

💪 Why Contractors Choose This Model

✔ Holds consistent pressure under load
✔ Reduces pressure fluctuation & trigger shock
✔ Handles long run times
✔ Reliable replacement for worn OEM unloaders
✔ Designed for commercial—not box store—machines

When you’re running jobs back-to-back, you don’t need guesswork.

🛠 Important Fitment Info

Before ordering, confirm:

• PSI rating matches your pump
• GPM capacity is within range
• Port sizes & thread types match your plumbing
• Spring color aligns with your pressure setup

If you’re unsure, match your existing model number or verify pump specs.