Very true Pat, and the spin ons to fit the Bosch head are nearly as ubiquitous, as they are standard fitment on so much ag and industrial machinery, you just can't see in the bottom, but they do have the drain.
Have to say I don't think I've ever had garbage in the main filter, the sedimentor is pretty remarkable at dropping crap before it goes too far.
Can't say the same for the Patrol, thank my deity it has a water alarm built in.....

