ACT D'MAND KONTROLS System S3-100 Series System<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>System includes an electronic circuit board， thermosensor mounted in stainless steel volute， 3/4" CPVC threaded connections and internal check valve</li><li>Recommended for use with dedicated return lines in buildings up to 4，000 sq. ft. with tank water heaters</li><li>Pipe runs up to 200 lineal ft. with tankless water heaters</li></ul></div><img src="http://ecx.images-amazon.com/images/I/316ANqFOJ2L.jpg" noproxy>