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5/8" -18 UNF Female (adapts directly to sealing nut on AutoMeter Mechanical Temp Gauges) to 3/8" NPT Male
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![AutoMeter 2272 FITTING, ADAPTER, 3/8\" NPT MALE, ALUMINUM, RED, FOR MECH. TEMP. GAUGE](https://sdda.semadata.org/Standard/Auto Meter/2272.jpg "AutoMeter 2272 FITTING, ADAPTER, 3/8\\" NPT MALE, ALUMINUM, RED, FOR MECH. TEMP. GAUGE")
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