This is the stock style heater supply hose which runs from the black metal heater supply tube to the heater core inlet on your 1994-95 5.0L V8 Mustang.
One one the most common sources of coolant leaks are your Mustang's radiator and heater hoses. These hoses allow coolant to enter and leave the radiator and heater core to both cool the engine, and to heat the interior of the vehicle. Over time these hoses can get hard and brittle and can crack or break. Give the hoses a feel. Hoses should not be excessively hard, brittle, soft, mushy, or swollen.
If they are, be sure to replace them as soon as you can with high quality replacement hoses from Latemodel Restoration Supply.