Combination Valve Install question

Factory disc, the valve was horribly rusty, installed the new combination valve, had to tighten the fittings good but so far no leaks, and fluid is staying where it should in the master!
I looked at the date on that original valve and it was put on there a month before I bought the car, prev owner wasn't very knowledgeable on stuff like that so they probably through the incorrect part on there.