Replacing Barb Connector on Current Prime 1/3 HP Tower Chiller

[princer7]

The chiller has barb connectors and I would like to replace them with due to height restrictions. There is a threaded 1" part the barb connects to but I have not been able to find a matching thread. Both the grey and white PVC does not seem to work.

Any suggestions? :confused:

Current Prime Tower Chiller Model 2646 1/3HP