Decent anti siphon device

Hello.
Can anyone recommend a good anti siphon device.
I have been using one that is secured with grub screws, it kept coming loose and was a nightmare for leaking, so it’s gone.
So, I’m looking for a bit of quality.
And, with respect, I’ve heard all the stories about holes being drilled etc, in my experience with one fitted,I’ve never had a problem.