C3-100-PF ACT D'MAND KONTROLS System Series SystemThis D'MAND KONTROL® System includes an electronic circuit board, thermosensor mounted in composite volute, 3/4" CPVC threaded connections, and internal check valve.Recommended for use with dedicated return lines in buildings up to 4,000 sq. ft. with tank water heaters. Or pipe runs up to 120 lineal ft. with tankless water heaters.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.