A detailed technical illustration of a 1 1/2 inch pipe connecting to a 4-inch pipe with a labeled 90-degree elbow fitting.

The design involves connecting a 1 1/2 inch pipe into a 4 inch pipe, with a 90 fitting centrally placed within the 4 inch pipe. The 1 1/2 inch pipe extends halfway into the 4 inch section, where it connects to the Charlotte Pipe fitting. This setup forms the basis of the bubble diffuser system. See more