INNERCO manufacture Brass Single valve with gauge and Aluminum single valve with guage Brass Body:
IC-466:  Single Valve Without Gauge
IC-466G: Low/High Gauge
IC-466GF: Low/High Gauge with Protector Rubber

Aluminum Body
IC-467GF Single valve without sight glass , with gauge 
IC-468GF: Single valve with sight glass , with gauge

Gauge can designed for R12,R22,R502,R134A,R404A,R407C,R410A