Master cylinder upgrade

[Jeep401]

Let me start by saying I've already spent many hours reading all the previous posts I could find on this subject and there are a lot of them, with a lot of good information!
After reading the posts and searching the Internet for a replacement master cylinder, a couple of things have come to light.
The Warner part number 131759 that was the part of choice is no longer available. A post referenced a Centric 130.79025 as being the same which I was also able to cross reference.
The Centric number has several applications, all of which are disc/drum setups that use a check valve in the rear line, which this cylinder has. I wasn't able to find this information on the Wagner part.
So here is my question.
Did the Wager number have the check valve?
If so, did anyone remove it, or just run with it?

My plan at this point is to buy the Centric, I'm just not sure what to do about the check valve.
I'm sorry to bring this topic up again but as time goes by and part availability changes, so does the information needed to make safe and proper choices.
Thanks in advance for your input.

[Old Scout]

...I've followed this thread for several years and have helped several Alpiners switch out their MCs with the Warner product. This is the first I have heard of a check-valve for the rear axle....