Reactor 3 E-30 Spray Foam Proportioner SystemsGracos hydraulic Reactor 3 E 30 spray foam machine is a system built for contractors looking for a machine with more output and capabilities. It is ideal for contractors focused on growing their business doing typical residential and commercial spray foam work. The E 30 spray foam machine is an ideal machine that can be the workhorse of your fleet, capable of handling most types of jobs with a good mix of output, heat and features. Upgrade your rig