I didn't know that there are two manufacturers of ventriculostomy drain equipt. Only brand I've worked with is CODMAN. That's just a "BTW". Anyhow, got to poking around and found a source for you. Probably more than you ever wanted to know.
Type into your search engine:
utmb nursing practice standards neurological drainage
It will take you to the U of Texas Medical Branch procedure manual in pfd. I'd post the hyperlink but it's about a mile long.
Little story about ventriculostomies. First time I assisted the NeuroSurgeon putting one in I was amazed at the kit he opened up. An old hand-operated carpenters drill!!! (Actually, a 'bit and brace') He shaved and prepped the Pt's head, clamped in a drill bit and proceeds to start drilling into the guy's head. Whoa!!! This is a far cry from a chest tube or central line!!! My 'pucker factor' was off the chart!!
"Uh, Doc," I said, "how do you know when to stop?"
"That," he said, "is why it's a five year residency."
There you have it. Five years learning when to stop drilling.