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API 6A Back-Pressure Valve – Northern Gauge Northern Gauge API Thread Gauge Manufacturer & Supplier a comprehensive range of Back Pressure Valve. All gauges will be supplied with a Calibration Report with stand-off dimensions from a MASTER that has been certified by ISO 17025 CALIBRATION. Northern Gauge manufactures API working, reference and regional master gages per U.S. Steel specification. Northern Gauge offers API Thread Gauging and API 6A BPV to know more call on Toll-Free: 1-855-449-4935 (Canada and USA). Read More - https://www.northerngauge.com/api_thread_gauging/api-6a-bpv/ Website - https://www.northerngauge.com/ Address - 202 Tideland Road, Broussard, Louisiana USA 70518 Email ID - salesusa@northerngauge.com Contact Number - 337-426-1992