Male to Male Connectors are an easy means of installing a precision orifice into common system hardware. For elevated pressures, the fitting should be oriented so the flow will push the orifice into it's seat.
RB82416 is a male to male brass connector for 1/8-27" NPT thread size. This connector is available in all three orifice styles in sizes from 0.0004" thru 0.081".