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Amazon.com: CARBO Instruments Gas Test Pressure Gauge 15 Pound, 15 PSI / 100 kPa, 3/4” FNPT Connection, Brass Valve, Forged Brass Bell Shape Body Assembly. : Industrial & Scientific
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Winters Instruments 2.5 in. Steel Case Pressure Gauge with Brass Internals and 1/4 in. NPT Bottom Connection with Range of 0-5 psi/kPa PLP305 - The Home Depot
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Amazon.com: CARBO Instruments 4" Gas Test Pressure Gauge 15 Pound, 15 PSI / 30 in of Mercury, 3/4” FNPT Con, Stainless Steel Case, Accuracy 1%, Red Pointer Pressure Memory, Chrome Plated Steel
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