The Sporlan 168304 BQC-AA is a precision-engineered replaceable valve cartridge designed for use with Sporlan BQ series thermostatic expansion valves

This field-installable heat strip is the standard for maintaining air handler performance and ensuring the integrity of the original equipment manufacturer (OEM) specifications for Bard series wall-mount systems

Manufactured with heat-resistant polymers to handle high-temperature fluid transfer

Common Questions: What does a 'Pressure Switch Open' fault code mean

How many filters are required for a standard mini-split head

Siemens Industrial Controls 3RH1921-1DA11 Switch 323055-751 The Sporlan 168304 BQC-AA isOptimize your control circuitry with the Siemens Sirius 3RH1921 1DA11, a precision engineered auxiliary switch block designed for secondary switching and status feedback. This first lateral mount unit features a compact 10mm width and provides 1 NO (Normally Open) and 1 NC (Normally Closed) contact configuration. Engineered for industrial reliability, it integrates seamlessly with Sirius 3RT1 contactors and 3RH1 contactor relays from sizes S0 through