Used Watts PLT-12 potable water expansion tank - $75 (Linden, NJ)
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make / manufacturer:watts
model name / number:plt 12
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Watts PLT-12 potable water expansion tank.
It is designed to absorb the increased volume of water caused by thermal expansion in a closed-loop potable water system.
The tank maintains balanced pressure throughout the system below the relief valve setting.
It is a pre-pressurized steel tank with an internal expansion membrane (butyl diaphragm) that prevents water contact with air.