Z20 engine coolant bypass

[Wantstolearn]

My D21 has a z20 engine and the coolant bypass passge That I think has the bypass restricter inside of it. The T tube fitting for this passge that is threaded to the bottem of the intake has rusted off and I need to replace it but I cant find out what the part is actully called or anywhere that sells it so Ive taken to the internt hoping you guys can help me out 

[datzenmike]

Called connector-manifold. Try 14075-W0401 it's the fitting directly under the carburetor on the underneath side of the intake. The heater return flows through it and collects the coolant from the intake and directs it to the lower radiator return to the water pump. This is for all carburetor Z20, Z22 and Z24 engines. 

 

There is no restriction in it.