A self-trimming in-wall receptacle and method therefor, comprising a receptacle having a storage area, a trim and a coupling mechanism that allows a person to insert the receptacle into an opening in a wall. The receptacle is self-trimming and easy to couple to a wall, eliminating the need for complicated installation. The self-trimming in-wall receptacle can substantially flush-mount wall-mounted electrical objects such as smoke detectors, air conditioning control units, alarm keypads, doorbell chime boxes and the like, as well as store other objects.

 
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> Method for controlling the integrity of a nanofiltration or reverse osmosis module, or module system

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