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This is interesting. My pressure relief valve came from Vertex and is indeed part no. 94410703511. It has the one green O-ring on the end. The two O-rings I got from Zim's were both listed as for the pressure relief valve, part nos. 999.707.145.40 and 999.707.146.40. One of them was green, and an exact match for the one on the valve. The other was the black one. Maybe the retrofit valve for the older cars, mine's an 84, is only supposed to have one O-ring.
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