Century 3 4 HP Milk Pump Motor,3 Phase,3450 Nameplate RPM,208 230 460 Voltage,Frame 56HCZ B597 Drain Type Centrally rising vent w supplies from above (B drain) Gravel bags are a basic Gravel bags are a basic BMP (Best Management Practice) used to meet regulatory requirements for stormwater and erosion controlThe sizes are industry standard and allow the user to fill them up with as much or as little gravel as the application requiresDifferent sizes lend themselves to different applications Includes: 1"Adjustable Bulletfeet The totally enclosed It also features rolled steel construction for lower weight and excellent environmental durability