Hi, Sorry to hear you are not entirely satisfied with the new Vacuum.
This vacuum fits a standard 1-1/2" or 1-1/4" vacuum hose.
We are wondering about the vacuum hose issues and if that is affecting the usage of the new vacuum head? If you are using a standard spiral vacuum hose, made for manual vacuuming and there are no issues (holes) in the hose, it shouldn't collapse. To discuss further, you are welcome to call our Poolmaster Customer Service Dept directly, Monday-Friday, 8:00-4:00 Pacific Time at 800-854-1492.
We will be happy to help with troubleshooting.