Sorry, i couldn't describe my problem clearly. What i mean by elbolet is that it has three ends (like ordinary Tee). One end is connected to the main pipe 4", other two ends is connected to the two reducers, what i mention earlier. I'm familier with elbow and tee connection, but not with this unusual elbolet ( sometimes may be named as Tee-Elbow, i saw this name couple of times). please give me some suggestions.
_________________________
Mech