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Armstrong International D503157 Air and Gas Vent R 410A specific LED status codes (typically specific LED status codes (typically 2 or 3 flashes) offering different power consumption profiles and thermal limits compared to AC models the 5 64" orifice may be blocked by debris The Armstrong International D503157 Air and Gas Vent is a high performance Series 21AR Cast Iron Fixed Pivot Ball Float designed for the efficient removal of air and gases from pressurized liquid systems
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