FJC 6692 R12/R134A Brass Dual Manifold Gauge Set. Brass dual manifold gauge set for use on R134a, R12 and R22 air conditioning systems. Brass block design Complete 72 inch hose set R134a quick couplers and R134a tank adapter Professional Quality. The item "FJC 6692 R12/R134A Brass Dual Manifold Gauge Set" is in sale since Tuesday, September 17, 2019. This item is in the category "Business & Industrial\HVAC & Refrigeration\HVAC & Refrigeration Tools\HVAC/R Gauges & Probes".autoparts" and is located in Phoenix, AZ. This item can be shipped worldwide.