Neptune offers a complete line of bung entering drum mixers. Neptune’s E and F Series drum mixers are equipped to handle low viscosity/water-like liquids that use a folding propeller for proper drum installation. Neptune’s H and HGS Series are equipped with permanent blades to have the capability to handle more viscous fluids up to 32,000 cPs. All drum series mixers fit through the standard 2" (51 mm) bung on 55-gallon (208 liter) drums.