A4TU4-W is a quick-connect tee 1/4T x 1/4T x 1/4T for connecting hoses in water treatment systems, including under-sink systems and reverse osmosis. Installation involves pushing the hose firmly into the fitting, without additional twisting and without Teflon tape. It allows for easy splitting or redirecting of the water flow, e.g., to a second draw-off point or to the refrigerator.
A4TU4-W 1/4T x 1/4T x 1/4T tee fitting is a push-fit component for connecting and splitting 1/4" tubing in water treatment installations. It is suitable for solutions such as reverse osmosis, RO filter, reverse osmosis system, and other installations that use a water filter or an extended water filtration system. Installation simply involves pushing the tubing in as far as it will go, without twisting or using PTFE tape, which speeds up installation and makes subsequent system modifications easier.

The A4TU4-W is a tee with three 1/4T connections, designed for connecting 1/4" (6,4 mm) tubing. This type of fitting is used wherever water flow needs to be safely split or redirected in compact pipe and tubing installations.
The product is primarily used in under-sink water treatment systems, including installations based on a reverse osmosis filter. Thanks to its push-fit design, it can be quickly connected to an existing system or used when building a new installation.
The A4TU4-W tee is a practical solution for users expanding a water filtration system in a kitchen or utility room. It can be used in installations where treated water needs to be routed to more than one outlet.
Typical applications include:
The tubing is secured by pushing it into the fitting as far as it will go. There is no need to twist the connection or use PTFE tape. This installation method significantly speeds up the process and reduces the number of additional accessories needed to connect the system.
The push-fit solution is valued for its ease of use. In practice, this means easier installation, more efficient servicing, and more convenient adaptation of the system to current needs.
Before inserting the tubing, make sure that its end is cut evenly and squarely. Pushing the tubing all the way in helps ensure a proper, leak-tight connection in the water treatment system.
This model is a good choice when the installation requires a simple branch in 1/4" tubing without using more complex installation components. It is a practical part for expanding a system supplying an RO filter, routing water to a refrigerator, or creating an additional treated water outlet.
Thanks to its compact size and quick connection method, the A4TU4-W works well both during initial installation and when upgrading an existing reverse osmosis system.
| Model | A4TU4-W |
|---|---|
| Product type | push-fit tee / tee fitting |
| Connection configuration | 1/4T x 1/4T x 1/4T |
| Compatible tubing diameter | 1/4" (6,4 mm) |
| Connection type | self-sealing push-fit connector |
| Installation method | push the tubing in as far as it will go |
| Twisting required | no |
| PTFE tape required | no |
| Application | connecting and splitting tubing in water treatment installations |
| Compatible systems | under-sink water treatment systems, reverse osmosis systems, installations supplying water to additional outlets and appliances |
The A4TU4-W model is designed for 1/4" tubing, i.e. 6,4 mm. All three connections are the same size: 1/4T x 1/4T x 1/4T.
Yes, the fitting is used in under-sink water treatment systems, including reverse osmosis installations and RO filters.
No. This is a self-sealing push-fit connector, so the connection is made without using PTFE tape.
No, installation simply involves pushing the tubing into the fitting as far as it will go. This makes installation quick and convenient.
The fitting can split treated water between two outlets or route it from the filter to another appliance, such as a refrigerator.
Yes, this solution is specifically designed for under-sink water treatment installations that use 1/4" tubing.
It is best to cut the end evenly and push the tubing straight in as far as it will go. This installation method helps ensure a proper, leak-tight connection.
The A4TU4-W tee can both connect and split the flow between three 1/4" tubes, making it a highly versatile installation component.
A4TU4-W is a quick-connect tee 1/4T x 1/4T x 1/4T for connecting hoses in water treatment systems, including under-sink systems and reverse osmosis. Installation involves pushing the hose firmly into the fitting, without additional twisting and without Teflon tape. It allows for easy splitting or redirecting of the water flow, e.g., to a second draw-off point or to the refrigerator.