You might wish to check out this site, it was recommended to
me by TCM Continental.
www.oilamatic.com
I called them (800-343-7623) and they recommended the model
2100A for my IO-550.
Anyone else interested? If so, I will see if we can
get a discount on a group order that I will be happy to coordinate.
Please contact me at rbrice@inter-linc.net.
Ron