S3-100-PF ACT D'MAND Kontrols Hot Water Recirculation Pump w/PF-Kit This D'MAND KONTROLS® System includes an electronic circuit board, thermosensor mounted in stainless steel volute, 3/4" threaded stainless steel flanges, and internal check valve.Recommended for use with standard plumbing systems in buildings up to 4,000 sq. ft. with tank water heaters. Or pipe runs up to 100 lineal ft. between a tankless water heater and installation location of the D'MAND KONTROLS® System.PF-Kit includes two (2) stainless steel 3/4" ID, 18" corrugated flex lines with threaded male/female ends, and two (2) custom machine tooled no lead brass T's.