# Rear Box Lid

***TheShadow® Overflow Rear Box Lid is designed like no other. It is able to create a water tight seal on the rear box assembly. This assists in noise reduction, preventing salt creep and stopping water from exiting the rear box. This lid creates a Vacuum that assists with the flow of water down the drains. Th sealed lid makes it impossible for the overflow box to well, overflow. There is no other overflow system on the market with this attention to detail and precision fitting lid.*** 

<figure><img src="/files/SaVVzENBLegLEeIdgKOj" alt=""><figcaption><p>Shadow® Overflow Rear Box Lid </p></figcaption></figure>

{% hint style="success" %}
***If you have any salt creep issues please read the Trouble Shooting tips*** [Salt Creep](/installation-manuals/the-synergy-reef-shadow-overflow/trouble-shooting-tips/salt-creep.md#how-to-eliminate-salt-creep)
{% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.synergyreef.com/installation-manuals/the-synergy-reef-shadow-overflow/exterior-rear-box/rear-box-lid.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.