---
title: CDU (Pleur-evac) Modification Instructions for Use with the Avthor
description: Tools, materials, and easy steps to get your CDU (Pleur-evac) ready for repeated use.
---

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# CDU (Pleur-evac) Modification Instructions for Use with the Avthor

## Tools, materials, and easy steps to get your CDU (Pleur-evac) ready for repeated use.

Modifying your CDU allows it to be drained, cleaned, and reused safely with the Avthor.

**Items Needed:**  
•  Recommended: Safety glasses  
•  Drill  
•  3/8” Countersink drill bit  
•  Optional: Hemostats, water-soluble lubricant  
•  Black Neoprene Plugs (Suggested product can be found **[HERE](https://www.caplugs.com/p/black-neoprene-plugs-bn-sh?itemNumber=BN000\))**) 

**Steps:**  
**1.** Identify each of the chambers on your CDU (Pleur-evac).  
        *Note: Devices shipped from Avkin most often have 5 chambers.*

![](https://help.avkin.com/hs-fs/hubfs/image-png-Aug-29-2025-12-51-33-6706-PM.png?width=878&height=566&name=image-png-Aug-29-2025-12-51-33-6706-PM.png)  
**2.** Choose a location in each chamber where you can drill a ⅜” hole without damaging another area or chamber.

**3.** Once identified, mark each location with a permanent marker.

**4.** Using the drill, slowly create a starter hole. Because the plastic may be brittle, gradually widen the hole until it reaches ⅜”.

**5.** Remove any plastic shavings from the hole.  
        *Tip: Hemostats may help with this step.*

**6.** Insert the smaller end of the neoprene plug into the hole to ensure proper fit.  
        *Tip: If the plug does not insert smoothly, apply a small amount of water-soluble lubricant.*

**7.** Once all holes are plugged, perform a pressure test to verify that the device holds a seal with no air leaks.

**8.** All Done! 

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