the other endpoint also as used herein the terms u201c optional u201d or u201c optionally u201d mean that the subsequently described event or circumstance may or may not occur and that the description includes instances where said event or circumstance occurs and instances where it does not as used herein the term u201c facilitate u201d means to make easier or less difficult and the terms u201c inhibit u201d and u201c impede u201d mean to interfere with hinder or delay the progress also the words u201c proximal u201d and u201c distal u201d are used to describe items or portions of items that are situated closer to and away from respectively a user or operator thus for example the near end or other portion of an item may be referred to as the proximal end whereas the generally opposing portion or far end may be referred to as the distal end although the various embodiments are described with reference to a waste water or sewer line the assemblies system and methods may be used to detect or monitor the flow of any fluid through a conduit or other structure fig1 is an illustration of a system for detecting impaired flow of a fluid through a pipe according to particular embodiments as shown the system includes a plastic intermediate test cap 7 that is positioned within a substantially vertical pipe 2 and that supports a wireless transmitter 4 the test cap 7 is referred to as intermediate in order to distinguish it from the top cap 1 which may be used on top of the assembly the vertical pipe 2 may be a pvc pipe that is.