---
title: Smith Roof Drain Optional Variations - Separate Expansion Joint
description: Learn more about the Smith separate expansion joint, a roof drain optional variation.
---

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# Smith Roof Drain Optional Variations - Separate Expansion Joint

## **![Expansion Joint](https://resources.hy-techroof.com/hs-fs/hubfs/2022%20Hy-Tech%20Website/Roof%20Drain%20Specs%20Pages/Smith%20Drain%20Specs/Smith%20Drain%20Resources/Expansion%20Joint.png?width=250&name=Expansion%20Joint.png)**

## **Separate Expansion Joint**

The separate expansion joint with internal seal is not exposed to the flow drainage passing. However, provisions must be made in the installation for access to the outside packing glad adjustment nuts. These units should only be used in a vertical position and with a roof drain.

**Please Note: Do not use with Speedi-Seal and plastic leaders.**

## **Roof Drain Recommendations**

- **Expansion Joint:** Use the Smith No. 1710 cast iron body and packing gland with bronze expansion sleeve, wing nuts and bolts.

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