Heater hose and belt tensioner

1998 lesabre heater hose elbows on the belt tightener assembly - Where does the elbow with the restrictor in it go, toward the heater or is the restriction in the one coming back to the engine from the heater?

Took both heater hose elbows off the belt tightener assembly (Was cracked at one of the elbows). Did not realize that one has a spring loaded restrictor in it. Which port does the elbow, with the restrictor, in it go? The port(heater hose) going to the heater or the hose coming back to the engine from the heater.