I cut out a section of the 4" line and added a swept tee so the 1-1/2" line from the pump discharges into the 4". The two black sleeves are called no hub fittings and are the only way you can tie into an existing line as you cannot move the ends of the 4" away enough to get a standard tee in. The tee I installed is a 4x4x1-1/2 and I glued a couple of short sections of 4" pipe into the ends which allows the rubber boot to connect to the existing 4" pipe. Hope that makes sense.
I've seen some people here on RC use those no hub fittings as a flexible connections to their pumps but I'm not sure that they're rated for pressure as they are designed to be used on drain lines only.
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Alan
"Never in the field of human conflict was so much owed by so many to so few. "
Sir Winston Churchill praising those young RAF pilots.
August 20th 1940
Click on my name for drop down list and select "Visit EnglishRebels Home Page" for my build thread.
Current Tank Info: 60x30x24 200G AO custom glass tank, basement equipment room, 30G and 55G Fuges, LifeReef sump & 30" skimmer.
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