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Great idea and I like to keep this thread alive.........I wonder if using tow 45 degree elbows would make this quiter than having the 90's. The double sleeve idea sounds great. I plan on trying this using 1.5"pipe for the outer pipe and 1" pipe for the inside pipe. On each end of the 1 " pipe, there will be 1.5 " to 1 " adapter/ reducer fitting. The adpaters/ reducers will be sanded down on the inside to allow the 1 " pipe to slide all the way thru. The 1" pipe can then be connected to the elbows and bulkheads. For getting rid of the air, would putting y-tees on the outside have the same result as using t's on the inside of the tank? How can the herbie method be incorporated in this?
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