Why use black tubing instead of clear or translucent

consider the Belimo B310 valve

Like all furnace replacement parts of this type

the switch is calibrated to open the circuit at 200°F if overheating occurs and features an auto-reset function that closes once the temperature drops back to 101°F

York S1-026-32264-001 Pressure Switch 30067439-890 Why use black tubing insteadThe York S1 026 32264 001 is an OEM certified 1. 25" WC pressure switch engineered to maintain critical safety standards in residential gas furnaces. This SPST (Single Pole Single Throw) air pressure sensor acts as a direct replacement for S1 026 32263 001, providing a precise drop in solution for York, Coleman, and Luxaire HVAC systems. In high efficiency combustion setups, this switch monitors the negative pressure generated by the inducer motor,