The High Performance AMTROL Pressurizer is a true whole house pressure boosting system. The units are pre-assembled with a low-suction cutoff, thermal overload protection and built-in junction box. The AMTROL Pressurizer includes a properly sized pressure tank to reduce pump cycling. This decreases power consumption while drastically improving motor life. Unlike small in-line models, this pressure tank provides additional water storage to meet peak water demands while improving efficiency. Amtrol® Pressuriser® Water Pressure Booster System, Series: RP-HP, 115/230 V AC, 1 ph, Stainless Steel Housing, 1-1/4 in NPTF x 1 in NPTF Connector, Trimmed Impeller