A few years ago I had occasion to use-up a box full of 3/4" old ( 10 to 15 years old ) diecast couplings and some connectors. They were never used before, new but just old.
Almost every one cracked open when tightening the set-screw.
That cured me from using die-cast fittings.
Had installed many-many fresh-off-the-shelf of the same brand, in years gone by, and do not recall having that cracking problem.
