Banjo fittings on both ends, the supply side a flexible rubber hose and a hard line to the injectors side. It's pretty cool in that the filter has ears to hold the lines in proper orientation so they don't spin and kink when you loosen the banjo bolts through the fittings. Those actually broke loose with no trouble.
Here is a good shot of the filter, showing how it mounts to the bottom of the intake manifold:
Here it is in its native habitat, looking up from underneath the truck:
