Interior Rear Box Plumbing
This is an Advanced Level product. Due to hundreds of different aquarium plumbing setups, pumps, sumps, ect, Synergy Reef DOES NOT Provide specific tuning assistance with this overflow. We can provide basic installation assistance, but setup and tuning to your aquarium is up to you. This can be done by anyone as long as you take the time to properly setup your system. Proper plumbing of the overflow to the sump also plays a big part in turning the overflow, not just the internal plumbing. If you are not capable of doing this, please hire a professional to do so.

Interior Box Tuning

Dry fitting it all that is needed. —
Important Note:
The inside holes for the pipes in the rear box are made slightly larger than the PVC Pipes. The color PVC has slightly smaller tolerance than white PVC. The inside pipes will be slightly loose. This is normal.
  1. 1.
    Put a small amount of PVC glue on the ends of the pipes and let it dry.
  2. 2.
    It may take 2 layers but the pipes will fit tightly into the holes after that.
Do not glue them into the inside of the box, just put glue on the pipes themselves and create a small layer of glue and let it dry. The pipes will fit tightly as the glue acts like a gasket.
1. First Cut 1.5” PVC into 3 pieces. 1 x 6.75”, 1 x 3”, 1 x 4” These are just rough sizes and you may need to slightly modify the lengths to your system’s flow.
In some setups you may not need to use the U-pipe on the secondary drain. The U-Pipe on the Secondary drain may only be needed in very high flow systems (over 2000 GPH)
2. You will need to attach the following parts: a) 3” PVC Pipe to Synergy U-Pipe elbow (included in kit) b) 4” PVC Pipe to Synergy U-Pipe elbow. (Please Read Note Above)
3. Connect one or both of the U-Pipe assemblies you just made into any of the holes inside of the rear box assembly.
4. Connect the 6.75” PVC Pipe into the last open hole inside of the rear box assembly. This is your Emergency drain.
5. See FIGURE A.1 for finished assembly.
The length of the pipes used inside the rear box are determined by your system's design and setup. There is not a "one size fits all" answer to what you may need on your system. The above pipe lengths are a good starting point for most and will work for most setups that are running under 1500 GPH. You may need to adjust the lengths of the pipes to work with your system. See Basic Tuning Approach for some pointers.
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