That steel pipe connects to both the heater core, and water pump.
Its pretty easy to replace, undo it from the thermostat housing first. Just make sure the rubber O ring is good when you put the replacement in.
EA-ED are the same, But EF onward are a little different.
Wreckers should almost give the things away, but might be best to grab a new one.
CAUTION: Slippery When BOOSTING!