Honeywell calibration Kit, includes tubing, flow adaptor, regulator, 2-cylinder carrying case for XCD Combustibles Kit (contains 998-100-004 tubing, S3KCAL flow adaptor -calibration cup-, 998-100-012, 998-100-003 carrying case), 3/16" ID Tubing, gas cover, C-10 inlet regulator. (Does not include calibration gas)