Brass Ball Valve - ball valve
Recirculating pumpwater heater
Waterrecirculating pump
These systems all require an in-line air valve and shut-off valve. Other requirements will vary with the installation's configuration, but may include a check valve and an additional shut-off valve. The pump may be connected to a sensor with high and low temperature limits so that the pump circulates water through the loop only when the sensor calls for it.
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8615510865705 
8615510865705