480mm DIA x 900mm deep on straight. Welded dished base & bolted dished top. 4kW 1430-rpm 415/3/50 EExd IIB T4 motor driving variable speed gearbox. Shaft output speed 48 / 290 rpm 3 sets of 4 blade angled turbines. Design pressure: 30 psig & Full Vacuum. Stainless steel external limpet coil design pressure: 60 psig