Whats the purpose of this engine oil drain plug?

[xtriggerman]

I'm doing my second engine oil change and want to put a drain valve type plug in the pan. Problem is, I'v never seen a drain plug like the one in this 97. It has a black plastic/rubber outer plug in it with a spring loaded ported inner shank that is caped off. Is this Ford's idea of some kind of quick drain type ported plug? If so, how would it be used?

 

[Moes8]

i've never seen what you described on a mark viii engine. It comes factory with a standard plug. Sounds like something added on , or did you already know that and are just wondering why?https://images-na.ssl-images-amazon.com/images/I/915dYozqyVL._AC_SL1500_.jpg

 

[xtriggerman]

I didn't know if this is a Ford plug or not. This is my first Ford made Vehicle aside from a 87 7.3 F250 I had years ago. Maybe some one can identify it. It says A51 on the black cap.

I'm going to order an EZ drain valve any way but this is a curiosity.

 

[Pantera1973]

I didn't know if this is a Ford plug or not. This is my first Ford made Vehicle aside from a 87 7.3 F250 I had years ago. Maybe some one can identify it. It says A51 on the black cap.
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I'm going to order an EZ drain valve any way but this is a curiosity.

That appears to be a type of quick drain; definitely aftermarket.

Pry off that cap and I bet you'll see that it is threaded for some kind of drain tube to attach to it.