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|End Fittings:||16mm Male "O" Ring x 18mm Male "O" Ring - .172 Restrictor ID|
|Fittings Thread Diameter:||16 Male O Ring x 18 Male O Ring - .172 Restric mm|
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Q:What is difference between :.072 restrictor ID & .172 Restrictor ID; 1sr Design & 2nd Design; vin y & vin 9?
A:I'm happy to help, Ken! The restrictor ID is the inner diameter of the restrictor. .072 being smaller than .172. The VIN code is the 8th character indicating the engine type of your vehicle. It looks as though this was for a Cadillac Eldorado or Seville. The second design would be the design used later in the manufacturing process. You can find the date your vehicle was manufactured in the door jamb.