Modular assembly for drain trap

A modular assembly for a drain trap, comprising:

• an upwardly open housing of substantially prismatic shape with a generally rectangular horizontal outline having a sidewall provided with an exit port for waste water accumulated therein, said sidewall defining one of the minor sides of the rectangle and being internally formed below said exit port with a pocket open toward the top;
• a tubular insert having a closed top, a bottom inlet and a side outlet, said insert having a width substantially smaller than that of said housing in a direction parallel to the major sides of the rectangle and being provided with a depending foot portion adjacent said sidewall receivable in said pocket for juxtaposing said insert in said housing with said sidewall in a position of alignment of said outlet with said exit port, said insert being further provided at said closed top with an upstanding flange in line with said foot portion;
• and
• inwardly extending ancillary fastening means on said sidewall above said exit port engageable with said flange for securing said insert to said housing in cantilevered position on said sidewall.