I have those, only used them once so far and they worked fine
the ones originally posted have a built in one, which was handy with the water one because i have high water pressure hereUse with caution on older units or alum.
The old radiators were the easiest to clean....great big openings between fins.
High Air pressure will disintegrate old brittle rotten fins.
Will fold over some alum.
adjust your regulator to a safe space lol