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#HPC - Compact Size
- Clear acrylic bubble counter
- High-Quality threaded check-valve
- Silent Eheim water pump w/Two-Year warranty
- Open access to reaction chamber
- Micro-adjustable needle valve
- All Quick-Release fittings throughout
- CO2 mixes with water pump intake
- No Cheesy Flex hoses
- Quality fittings used throughout.......
Comparision Table | | CR422 | CR622 | CR622D | | Overall Height | 24" | 24" | 24" | | Reaction Tube Diameter | 4" | 6" | 6" | | Reaction Tube Height | 18" | 18" | 18" | | Base Dimension | 8" x 9" | 10.5" x 11" | 15.5" x 11" | | Water Inlet and Outlet Size | 1/4" Polypropylene Tubing | 1/4" Polypropylene Tubing | 1/4" Polypropylene Tubing | | Method of Feeding | Gravity or Pressure | Gravity or Pressure | Gravity or Pressure | | Recommended Capacity | 250 Gallons | 500 Gallons | 500 Gallons | | Included Effluent Chamber | No | No | Yes | | Supplied Water Pump | Eheim 1048-31 | Eheim 1250-31 | Eheim 1250-31 | Precision Marine products are drop shipped from the manufacturer.  | 
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