GeoVision GV-IPCam Hardware Manual page 63

Note: You can choose to run the wires through a conduit pipe. After you
have threaded all the wires, install the supplied conduit converter with a
PG21 conduit connector and a self-prepared conduit pipe (of 1/2'', 3/4''
or 1'') to the camera. Do not use a 1/2'' pipe if you use the power adapter
for power supply because the adapter cannot be threaded through. A
plastic PG21 conduit connector for 1/2" pipe can be purchased upon
request.
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Plastic PG21
conduit connector
Conduit pipe
Conduit converter