Drop head structure

A water drop structure comprising:

• a main body having a main through hole in a center, a positioning flange located on an inner edge and a U-shaped flange forming as opening;
• a main drum extending through the main hole, the main drum having a lower through hole on a bottom, and a peripheral portion of a top end having an inverted U-shaped flange engaging the U-shaped flange;
• a floatable control floating ball located in the main drum having a diameter greater than that of the lower through hole of the main drum;
• an upper partition having a spacer with a recess, the spacer having a partition spaced from the recess for engaging said U-shaped flange and a center having an upper through hole;
• and,
• an upper cover having a plurality of drop holes, extending over the upper partition and having a curved extension hood extending from a bottom thereof, the extension hood having a diameter greater than the upper though hole of the upper partition and smaller than an inside diameter of the upper partition so as to form a curved flow passage with the recess of the spacer wherein the control floating ball blocks the lower through hole of the main drum when no water passes through the structure and the floating ball blocks the upper through hole of the upper partition when fluid flows into the main drum through the lower through hole to prevent a fluid flow back-up due to a clogged condition;
• from passing through the curved flow passage, wherein the peripheral portion of the drum, a peripheral portion of the positioning flange, the inverted U-shaped flange, the U-shaped flange and an outer portion peripheral portion of the cover cooperates with one another to secure these elements to the inner edge of the main body.