It has been a loooong time but, I installed several ARB's back in the late 80's early 90's, basically when the first came out. I actually installed one of the first, if not the first, Toyota ARB in Ca. They did have some o-ring issues initially but they were quick to fix that. After that, we had no issues with them. Most home installers that had problems f'd up the o-rings, pinched the plastic line, or cracked the copper line during the install. As I recall they were the only driver activated locker at the time.