Stainless Steel

[Marlin65]

Put a smaller hose on just heat the end a bit to get it soft. I run a 5000 for my chiller and it has the same fitting. To get mine off I have to cut it off.

[mseepman]

Makes sure that if you use Zip ties, that you don't buy the kind with the metal clip inside the head. These hold a lot better than all plastic but they will rust and cause issues.

[superduperwesman]

+1 on the zip ties