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NNI INC, Fire Protection Butterfly Valves
Wiring to provide zone and tamper on s6000 using only 4 wires (2pairs
Nni inc, fire protection butterfly valves
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Supervisory switches: valve tamper switch, water level switch, air
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Supervisory switches: valve tamper switch, water level switch, airOs&y gate valve with supervisory tamper switch Fire fighting.
