Press-Fit Tube Fittings
Viega 90300 Viega MegaPress coupling With stop, 1-1/2" x 1-1/2"
What stands out about the B12336302 is how compact it is for tight spaces.
Zoro Select 816YK5 Press XL coupling with stop, 2.5"x2.5
A nice touch is the spout on the 4176597-4oz that controls flow.