The whatchmacallit (i.e., instant hot water tap) didn't come with the doohickie I needed (i.e. brass connector).
When I got home with it, the thingie inside the doohickie (i.e., integrated ferrule) didn't grip properly and I ended up getting sprayed with water (i.e., *&^%$!!).
Round 2 this evening.
Note to self: must remember next time that we have hard water, and to just start with the hacksaw when getting old parts off.