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These humidifier water chambers are designed to work with all M-Series Heated & Cool Passover Humidifiers.
Compatibility Information: Two chamber designs are available for MSeries Humidifiers: the R2B (Part 1003757) with side-by-side openings and the R3B (Part 1003758) with staggered openings. If you are unsure of which chamber you need, review the MSeries Chamber Differences Guide (PDF).
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