JMP Fill Panels in either 1-Circuit, 2-Circuit or 3-Circuit designs. These fill panels come with precision 1-Way Fill Valves and air gauges. A neat front panel and a machined mounting plate attach the Fill Panel to the model. Normally, our Tapered Filling Adapter is used with our 1-way fill valve. Also available is a 1-Way Valve with a screw in fill fitting.