The Series 'HCI' & 'HSS' horizontal pumps feature compact close-coupled design. A high efficiency semi-open impeller allows for less clogging & quick cleaning. Since the components are a cast, there are no welds to break. Also, cast construction provides a superior corrosion resistance over similar welded styles. This series feature the most widely accepted industrial mechanical seal designated as Type 21. This seal is mounted "in-board" and, thus tends to be self-cleaning. The seal is available as a single seal solution flush or as a double seal which uses external liquid as a flush. By adding the double seal, these pumps can better handle abrasives/salts and be protected from running dry.