Fixed orifice PCV valve for 99-02 LS engines 4.8 5.3 6.0

According to TSB #01-06-01-029B - (07/19/2002) this part replaced the check valve PCV and fixed high oil consumption. Dimensionally identical to the spring type valve but is hollow with a 2.5mm opening. Reference GM P/N 12572717. Engines 2003+ ditched the valve all together and built the fixed orifice into the valve cover

I have included both the original fixed orifice design file and the other labeled "PRINT" is optimized for 3D printing.