Moisture indicator cap for refrigerant systems

Claim 1

IN A REFRIGERATION SYSTEM, THE COMBINATION OF: A REFRIGERANT CONDUCTING PIPE LINE; A PIPE FITTING IN LATERAL COMMUNICATION WITH THE PIPE LINE AND BEING IN THE FORM OF A STANDARD MALE SAE FITTING HAVING A BORE OF A SMALL DIAMETER AND BEING PROVIDED WITH SCREW THREADS; AN INTERCHANGEABLE MOISTURE MONITORING ATTACHMENT ADAPTED TO BE THREADED TO THE PIPE FITTING AND INCLUDING A HOLLOW MANIFOLD CASING HAVING AN ATTACHING INLET IN A WALL THEREOF PROVIDED WITH FEMALE SCREW THREADS MATCHING THE THREADS OF THE STANDARD MALE SAE FITTING; PLURAL STANDARD SECOND MALE SAE FITTINGS PROVIDED EXTERIORLY ON SAID MANIFOLD CASING IN COMMUNICATION WITH THE INTERIOR THEREOF; PLURAL MOISTURE INDICATOR CAPS FOR APPLICATION TO GHE RESPECTIVE SECOND MALE SAE FITTINGS OF THE MANIFOLD CASING; EACH OF SAID MOISTURE INDICATOR CAPS INCLUDING A CYLINDRICAL BODY HAVING AN INNER END OPEN AND PROVIDED WITH FEMAL SCREW THREADS MATCHING THE EXTERNAL THREADS OF A CORRESPONDING MALE SECOND SAE FITTING AND WITH A WINDOW IN AN OUTER END THEREOF, A SIGHT GLASS COVERING SAID WINDOW, A MOISTURE INDICATING ELEMENT POSITIONED ADJACENT TO REFRIGERANT GLASS WITHIN THE CAP BODY FOR EXPOSURE TO REFRIGERANT FLOWING THROUGH THE PIPELINE, AND MEANS TO RETAIN THE MOISTURE INDICATING ELEMENT IN THE EXPOSED POSITION; AND WHEREIN THE RESPECTIVE MOISTURE INDICATING ELEMENTS DIFFER ONE FROM THE OTHER IN THAT THEY ARE RESPONSIVE TO DIFFERENT MOISTURE PROPORTIONS OF THE REFRIGERANT.