Alpine sells their own version of a rollover valve in the form of a mini oil tank that sits above the existing one. The way the piping is angled inside the mini tank prevents the oil from running out when the sled is upside down. I just installed one on my sled, the fella's at Alpine have them installed on all their Nytros and have had no problems with them! I'm having problems getting a pic put on here so PM me and I'll send you it.... Sherm