4.5"x20" ScaleZERO Scale Control System
- For whole house systems and large tankless water heaters.
- 4½" x 20" system with 1" ports (12-15gpm).
- System protects the heat exchanger and other parts against corrosion from limescale (minerals).
- Port and gauge threads have lead-free brass inserts to prevent leaking, cracking and mis-threading.
- Includes pressure gauge, bracket, hardware and housing wrench; all housings UV-protected.
- 5-year warranty on housings; 1-year warr. on gauges.