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Strato offers a BOC 500 orifice calibrator. The BOC 500 orifice is precisely calibrated to provide an air-flow rate of 60 cfm for brake pipe pressure from 70 to 110 psi. All BOC 500 orifices are gauged and flow tested on a specially designed test bench to ensure each unit provides 60 cfm under appropriate brake pipe pressure settings. Per Recommended Practice RP-402, each delivered BOC 500 is stamped with the brake pipe pressure, the corresponding orifice size, a unique serial number and the Strato name. The information also is kept on file at Strato.