Proportioning Valve: Disc/Drum w/lines Chrome 64-85This probably suits those seeking more bling operating 69 & 85 era GM Drum REAR DISC FRONT GM brake conversions. The proportioning valve body is set up for Disc Drum set ups.. there is another for disc disc.. so don't mix them if avoidable.. , lines out arethere also for use with 9 16" & 1 2" Ports, are stainless steel & Chrome mix ALSO BUY A "PVTOOL" if you don't have one.. listed under "PVTOOL" These are a Aftermarket reproduction copy of the GM