4127 Thermofisher 42i NOx Capillary, 15 Mil (Purple) 

Part Number: 4127Description: Capillary, 15 Mil (Purple) Compatible Instrument: Thermo Scientific Model 42i, 42i-D, 42i-LS NO‑NO₂‑NOₓ Chemiluminescence Analyzer Function: Ozone path flow restriction capillary, purple color-coded for quick identification

This 15 mil purple capillary is a critical routine maintenance consumable for the 42i series NOx analyzer. Capillary clogging or deformation causes flow instability, measurement drift and calibration failures. Regular replacement ensures your 42i analyzer meets EPA reference method requirements for ambient NOx monitoring data quality. Commonly included in Thermo 42i consumable kit 111842-01