- CPR Retrofit Overflow Box with Backing
An overflow box is a great way to keep the water level at a constant in your saltwater aquarium as well as increase the rate at which surface water, and the film and dust with it, is removed. CPR Aquatics are high quality, black acrylic and built in the USA. Install by using a bulkhead. Bulkhead size will determine your flow rate.
- Extra Small - up to 250 GPH
- Small - up to 500 GPH
- Medium - up to 900 GPH
- Large - up to 1200 GPH
- Extra Large - up to 1600 GPH
How to Choose an Overflow -CLICK HERE
- RSS05DX - 6 3/8" L x 2 5/8" W x 3 5/8" H (Nano tank)
- RSS07DX - 5 1/4" L x 3 7/8" W x 5 1/4"H (Up to 60 Gallon tank)
- RSS12DX - 7 1/4" L x 4 1/4" W x 5 1/4" H (Up to 120 Gallon tank)
- RSS18DX - 12 1/2" L x 4 1/4" W x 5 1/4" H (Up to 200 Gallon tank)
- RSS24DX - 18 5/8" x 4 1/4" W x 5 1/4" H (Up to 300 Gallon tank)
When choosing an overflow we suggest using the largest overflow box that will fit your tank. It is impossible to oversize an overflow.
The Best By Raymond on 2/3/2018Raymond would recommend this product to a friendThe best customizable overflow on the market. I already purchased the extra large, now purchasing another for my frag tank.
Well made By David on 3/22/2017David would recommend this product to a friendThese boxed seem to be very well made. I bought 2 for a 180 gallon tank that was already drilled but with no overflows.
Does the job By Lukas on 8/30/2015Lukas would recommend this product to a friendSolid build, fairly easy to install. Does the job perfectly.
Good, solid product By Eric on 1/11/2015Eric would recommend this product to a friendGot this for my 35 gallon cube. It is built soundly and feels solid. It works well, however, I wish some of the teeth were cut slightly bigger to allow more to flow through.
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Starting at: $4.99
Starting at: $4.99
What size overflow box would I need for a 46g bowfront tank?
The biggest factor is what type of plumbing you plan to put inside of it (and then just make sure you get an overflow large enough to fit it) but for a simple drain on a 46g tank the RSS07 Small should be plenty fine.
Can you achieve quite overflow with one of these ? Can multiple drains fit in the overflow box?
This can be silent if the herbie method or bean animal is used. They can accept multiple pipes depending on the size of the bulkhead used. You will want to measure the bulkhead width and make sure more than one will fit in the width of the overflow. Feel free to let us know if you have ny further questions!
What bulkhead do you suggest is best to attach overflow to tank? and does it come with the extra gasket required to make connection?
Have a great day!
Does this need to be siliconed to the tank, or will just a bulkhead hold it in place?
If you use an extra gasket for the bulkhead between the overflow box and tank then you would not need to use any silicone, the bulkhead itself would hold the box in place.
So what else do you need to order to install it.
To install the CPR overflow box, with backing you will need a proper plastic drill bit to drill through the acrylic overflow, as well as a diamond coated drill bit for the aquarium you will be placing it on. The drill bit size will be dictated by the plumbing size, and bulkheads that you choose to place in the overflow. We would also suggest using a small amount of silicone to seal the backing of the overflow to the tank as well to minimize any leaks between the multiple layers of materials.