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These traps consist of a silanized, borosilicate glass tube which is filled with Type 13X Molecular Sieve and Type 4A Indicating Molecular Sieve. The adsorbent material removes moisture form the gas stream while the chemically-inert glass tube eliminates potential contamination from outgassing or diffusion (a phenomenon commonly associated with plastic purifiers). The Type 4A indicating sieve will undergo a color change (from blue to buff) to alert when the adsorbent requires replacement.For operator safety, the glass housing has been encapsulated in a secondary clear plastic outer tube to provide protection from potential glass breakage while still providing a visual indication of the adsorbent’s condition. These traps are available in two different sizes.