Odd that a wash in Michigan would not have an undercarriage manifold, but a lot of us make our own anyway.
The Spinlite system I saw at a new wash in El Paso a couple of weeks ago had an undercarriage wash manifold, looked just like the other Belanger undercarriage manifolds I've seen. Pretty sure it was the same as this one http://www.belangerinc.com/undercarriage-manifold
JustaGuy, so I what I've understood from the link you provided, is that Undercarriage wash manifold is an add-on to the SpinLine, and it doesn't come along with the system, and I need to pay an extra to have it in the machine. Am I right?
I couldn't say if it came as a part of the SpinLite equipment package or if it was an add-on, sorry. I just stopped by to see a SpinLite system in operation in a real car wash. Dan from Pro-Tech was the distributor on the job, he could probably answer your questions. I don't know his direct number but Pro-Tech's main number is 972.221.1107