ERA used an air regulator that took pressure from the inlet manifold and fed it to the fuel tank. This replica item can be added into the air lines on a GP car to cut out erratic pumping of the hand pump between corners on track. Particularly good for methanol race cars. The pressure is regulated with an adjustable screw to stop any dangerous over pressurisation. Tula have made 10 off and have 3 left…. please call for a quote