87 Monte SS build

[Teamchevy]

Alright guys I ended up buying this disc/disc proportioning valve from eBay. But it has no markings whatsoever. Is there another way besides the marking to tell if it's a PV4 vs a PV2?
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Tony,

Did you get this figured out? How to tell the difference between a PV4 and a PV2?

Dave

 

[T-TOP TONY]

Tony,

Did you get this figured out? How to tell the difference between a PV4 and a PV2?

Dave

No sir, never did I'm just going to keep it, and if they lock up once they're installed, then I'll know it's the proportioning valve.

 

[T-TOP TONY]

Rear brakes arrived 😎