Watts ETA 180 Part of the ETA Series Geotextile Specifications Body Material Lead Free Specifications Body Material Lead Free Cast Copper Silicon Alloy Body Pattern Straight Brand Watts Disc Material Viton Disc Type Conical EAN 098268653328 Inlet Connection Size 1 4 IN Inlet Connection Size Metric 6 MM Inlet Connection Type Female Threaded Inlet Thread Type FPT Lead Free YES Maximum Operating Temperature Celsius 38 and ease of maintenance This 90 gallon pressurized expansion tank is designed to absorb the expansion forces and control the pressure in heating and cooling systems The excess water is contained in the heavy duty butyl bladder preventing tank corrosion and waterlogging problems