Filters and liquid/humidity indicators are designed for installation on commercial refrigeration systems and civil and industrial air conditioning systems employing Group II refrigerants. Filter driers are available in a hermetically sealed version or with a solid exchangeable cartridge. Hermetically sealed filters are supplied in the standard drier version, series 43, anti-acid series 42, bi-directional flow series 46, with indicator series 41 and mechanical series 45. Filters with a solid exchangeable cartridge are available in packages of 1 to 4 standard drier, anti-acid or mechanical cartridges. Liquid/humidity indicators are available with welded or flare connections in a monitoring only version, series 38, or monitoring + humidity detection, series 37 and 39.