This is an advanced-design gas purifier for applications requiring high-efficiency moisture removal with the benefit of a depletion indicator. The adsorbing materials are Molecular Sieve 5A and cobalt-free CoFree™ indicator, held in a sturdy glass tube. The gas to be purified contacts only glass, metal and the adsorbents. CoFree changes color from greenish-yellow to blue at 4-6% relative humidity to signal leaks in the system; the molecular sieve removes moisture to trace levels. Do not use with supply gas H₂O concentration greater than 0.1%. The glass tube is sealed with a special dual sealing system for extra protection from leaks. An internal frit at each end prevents particulate contamination. The inner glass tube in the CRS ZPure Moisture Purifier is enclosed in a plastic outer tube for safety. Dual Seal Design: In this design the glass inner tube is protected by a sealed outer plastic tube. Even if the glass tube fails, the gas system is fully protected against leaks. The ZPure Glass Filters and Purifiers are available with standard compression fittings or quick connect fittings in 1/4” and 1/8” brass and stainless steel. To purchase filter and quick connect fittings together please see products 202234-B-QC and 202235-B-QC. To purchase replacement fittings only, please contact Sales@ChromRes.com.