Zoeller 4294-0035 Model DX4294 Explosion Proof Sewage Pump 1.5 HP 230V 1PH 50' Cord AutomaticZoeller Model DX4294 Explosion Proof Sewage Pump Description Our Model DX4294 is the industry's only automatic explosion proof pump rated for Class 1, Division 1, Groups C & D or Class 1, Zone 1, Groups IIA & IIB. The 1 1 2 HP DX4294 is a fully automatic sewage pump that is equipped with a brass float that prevents sparking in hazardous locations. The Pump's vortex impeller allows it to pass 2" spherical solids. The impeller's clearance in relation to