Neptune Mixer Company manufactures portable top entering propeller mixers and offers a complete line of Bung-Entering Drum Mixers. Two styles for water-like solutions use a folding propeller for the mixer. Neptune Mixer Company has two styles (Series H & HGS) for viscous fluids use permanent blades and are offered in higher horsepowers. All Neptune Bung-Entering Drum Mixers fit through the standard 2-in. Bung on 55-gallon drums.