EXTERIOR REAR BOX: Gluing & Initial Planning

Attach 3 short pieces (approx. 4”) of 1.5” PVC to the bottom of the rear box. (4” Pre Cut kits are available here). If using 1" PVC you will need 3 x 1.5" to 1" Reducers. You can glue them directly into the bottom of the rear box. Your internal pipes can stay 1.5" and do not need reducers.

This shows how to glue in the PVC Pipes

We recommend you using Medium or Heavy Clear PVC Cement on outside of the rear box when gluing the PVC pipes to it. We have found that any PVC Cement will work, but care needs to be used when gluing to make sure the ports do not get excessive glue inside the openings. If the proper amount of glue is used it will not take any force to push the pipes into the ports. See figure A.2 Below:

We recommend that you attach 3 x 1.5” Unions (3 x 1" if you have reduced the pipes to 1") to the 3 pieces you just glued into the bottom of the rear box. This will allow for easy removal of the overflow if needed in the future or for moving the overflow to another tank later. Unions are not necessary but make for a better installation.

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