Liberty ARC18 Access Riser — Pump Chamber & Cover Kit for Pro370 / Pro380 Systems

Liberty Pumps ARC18 Pro370/380 Access Riser

The Liberty ARC18 Access Riser is a practical and robust solution for organizing and concealing your pump’s wiring and plumbing connections. Designed to slide over Liberty’s Pro370, Pro380, or Pro680 systems, this pump accessory keeps junction boxes, pipes, and valves below grade and out of sight—while providing easy access when needed.

Key Features & Benefits

• Organized Pump Chamber — creates a clean hidden space for pump parts & accessories, piping, wiring, and valves.
• Below-Grade Installation — supports burial of systems up to 18" below grade for Pro370/Pro380 models.
• Secure Cover Design — twist-lock lid retained by 4 stainless steel bolts, with padlock provision to deter unauthorized access
• 32" Diameter — accommodates large wiring and plumbing runs. 
• Polythylene Construction — corrosion-resistant and durable for underground environments. 
• Installation Kits Available — optional kits include check valves, wiring junction boxes (JB120 / JB230), couplings, elbows, pipe seal grommets, and more. 

Specifications

Applications & Use Cases

• Install above Pro370 or Pro380 submersible pump systems to bury connections below grade.
• Organize and protect pump parts & accessories, check valves, plumbing unions, and junction boxes.
• Recommended when installing outdoors or in landscapes where exposed piping or wiring are undesirable.

Installation & Notes

• Slide the ARC18 riser over the sealed basin before backfilling; rotate to align piping exit positions. 
• Drill appropriately sized holes for 2" discharge and vent lines; use pipe seal grommets to maintain a clean, secure exit path. 
  
• The twist-lock cover design allows easy removal while providing weather protection and deterring tampering.
• Note: The ARC18 is not a gas- or watertight tank extension—do not use it to increase basin volume.