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Three-way connector with three 1/4" (6.4mm) fittings for connecting hoses.
Used in under-sink water treatment systems, including reverse osmosis systems. The hose attachment involves pushing them firmly into the fitting, without the need for additional twisting or sealing with Teflon tape. This is known as a quick connector (self-sealing).
An example application is the splitting of treated water in a reverse osmosis system to two water extraction points. A4TU4-W is also used when there is a need to divert water from the filter to another device (e.g., to a refrigerator).