It seems there might be a misunderstanding or a terminology mix-up. Typically, “DCP” stands for Dry Chemical Powder, which is a common type of extinguishing agent used in fire extinguishers. However, the term “DCP gun” is not a standard industry term for a fire extinguisher component.

If you are referring to a device used to discharge dry chemical powder from a fire extinguisher, it’s usually the nozzle or discharge hose attached to the extinguisher. Different fire extinguisher types may have varying designs, but the basic principle is that the nozzle or hose allows the controlled release of the dry chemical powder onto the fire.

Here are some key points related to the nozzle or hose used with dry chemical powder fire extinguishers:

1. Nozzle Design:

   • The nozzle is designed to provide a controlled discharge of the dry chemical powder in a specific pattern to effectively suppress or extinguish the fire.

2. Hose Attachment (if applicable):

   • Some larger dry chemical powder fire extinguishers come with a discharge hose, providing additional flexibility and reach when directing the extinguishing agent.

3. Handle Operation:

   • The operation of the discharge nozzle is typically linked to the handle or lever on the fire extinguisher. When the handle is squeezed or the lever is pressed, it activates the release of the dry chemical powder.

4. Safety Pin:

   • As with other fire extinguishers, a safety pin is usually present to prevent accidental discharge. The pin needs to be removed before using the extinguisher.

If you have a specific context or more details about what you mean by a “DCP gun,” please provide additional information so I can offer more accurate assistance. It’s important to use fire extinguishers and their components in accordance with the manufacturer’s guidelines and for their intended purposes. If there are concerns or uncertainties, consulting with a qualified professional or the manufacturer is advisable.