Pressure Gauge Adapter, M16 Male & Female, 1/8 NPT F Tee - Pegasus Auto Racing Supplies
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Gauge Adapters for Pressure Instruments - PCI Instruments
Amazon.com: Brass Pipe Fitting Adapter, Pipe Fitting for Pressure Gauge BSPT Male to NPT Female(1/4" BSPT Male to 1/4" NPT Female) : Industrial & Scientific
Pipe to Fitting Pressure Gauge Adapter 1/4" Male to M14 Female - Walmart.com