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Retrofit Overflow Box Surface Skimmer by CPR

Retrofit Overflow Box Surface Skimmer by CPR

$ 24.75

CPR Retrofit Overflow Box for an Aquarium

  • Flow rate is determined by the bulkhead you use. 
  • High-Quality Black Acrylic
  • Clean grate, CNC machined
  • High Quality, Hand Crafted by CPR in the USA
  • Install with Silicone (for Glass or Acrylic Tanks) or Acrylic Cement (for Acrylic Tank only).

Available in 5 sizes:

  • RSS05: 6.25" x 2.5" x 3.7", 800 GPH, up to 40 gallon Tanks
  • RSS07: 5.5" x 3.5" x 5", 1000 GPH, up to 60 gallon Tanks
  • RSS12: 7" x 4.25" x 5.25", 1500 GPH, up to 120 gallon Tanks
  • RSS18: 12.5" x 4.25" x 5.25", 1700 GPH, up to 200 gallon Tanks
  • RSS24: 18.5" x 4.25" x 5.25", 2000 GPH, up to 300 gallon Tanks

Hole sizes for the bulkheads:

  • 3/4" Bulkhead: 1.5" (38 mm) Diameter
  • 1" Bulkhead: 1.75" (45 mm) Diameter
  • 1 1/4" Bulkhead: 2" (50 mm) Diameter
  • 1 1/2" Bulkhead: 2 3/8" (60 mm) Diameter

** If you do not have experience drilling a hole on an aquarium, please go to "youtube" and search for "drilling holes on glass Aquarium". There are many informative videos that will help your projects.

Please consider flow rate requirement before choosing bulkhead size:

 

Assume Gravity to Low Pressure

Bulkhead size

GPM
(with minimal pressure loss & noise)

GPH
(with minimal pressure loss & noise)

1/2"

7 gpm

420 gph

3/4"

11 gpm

660 gph

1"

16 gpm

960 gph

1.25"

25 gpm

1,500 gph

1.5"

35 gpm

2100 gph

2"

55 gpm

3300 gph

2.5"

80 gpm

4800 gph

3"

140 gpm

8400 gph

 

*These rates are with no restrictions such as elbows, valves, sponges and slip screen. 60 to 70% of above rates are average practical flow rate in Aquarium set up.


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