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This fitting is used when you want to "T-off" a 3/8" piping so that the water flow goes to two different endpoints, for example, one side could go to one outlet tap, while the second pipe leaving the T-joint goes to a second outlet tap at a completely different point. Another example is in the case of Domestic RO systems, the one pipe with go to the RO outlet tap, while the other pipe will go to a buffer tank.