K-BAGZ
De Plane! De Plane!
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Would this be what your talking about?
http://pages.ebay.com/link/?nav=item.view&id=190734276084
Link doesn't work
This is the item. Many different types and manufacturers, but all perform the same task.
Engine Block Internal Combustion Leak Detector Tester | eBay
EDIT I got your original link to work, but that is in fact a compression leak down test kit. It basically accurately defines the leakage rate of a cylinder. Whether the head gasket has blown, piston/piston rings are worn, the cylinder bore being worn, and possibly the intake and exhaust valves not seating correctly. Another very handy tool.