Heater Hose Coupler

[Rust Buster]

I've had zero luck so far, even at the dealer, so now I go to the experts. My daily driver 99 Sierra 2500 with the 6.0 started spewing coolant last night. Turns out the hose going to the heater core sheared right at the coupler. It appears it is some sort of quick disconnect that acts as a coupler between the barbed connected in the hose, and the barbed part of the heater core. Both my hoses have this, but the dealer shows no such thing in any of their diagrams. Has anyone else had this issue? The part I need is white and is about 3 inches long and 1.5 inches thick.
Thanks in advance.