The 1073825 Replacement gas cell O-ring, a 2-207 Viton O-ring incorporated into MultiGas 203X/603x Fourier Transform Infrared (FTIR) gas analyzers having a gas cell volume of 70mL. Situated between the themal spacer of the gas cell and the detector housing optical box, these orings serve to isolate the internals of optical box compartment from the external environment. As part of routine gas cell maintenance, 1073825 orings should be replaced upon becoming brittle, damaged or lost. Quantity of one 1073825 o-ring included (Two 1073825 o-rings required for full replacement)