Viega 90170 MegaPress tee Smart Connect technology 316 stainless steel, 2'' x 2'' x 1''

The 90170 is a reducing tee sized 2 inch x 2 inch x 1 inch, so the run is 2 inch on both ends and the branch takes 1 inch pipe. All three ends are press connections (P1 x P2 x P3), no threading or welding at any port.

It is 316 stainless steel throughout, which is the corrosion-resistant grade Viega uses for the MegaPress S line. That matters if you are running the line in a wash-down area, a chemical or marine environment, or anywhere a carbon steel press fitting would rust at the joint.

Smart Connect is Viega's unpressed-joint feature: an unpressed connection leaks visibly during pressure testing so the installer finds it before the system is charged. On the 90170 there are three separate press ports (2 inch, 2 inch and 1 inch), which means three chances to miss one on a crowded rack. Each port has to be pressed with the correct jaw or ring for its size.

That is exactly what it replaces. Pressing all three ports removes hot work from the job, which is the usual reason it gets specified in occupied buildings, food plants and anywhere a hot work permit is a problem. The tradeoff is tool access: the 2 inch ports need a full-size press jaw with room to rotate, where a welded branch needs only torch access.

Mixing metals is the thing to settle first. The 90170 is 316 stainless, so pressing it directly onto carbon or galvanized steel pipe puts dissimilar metals in contact at the joint, which is a galvanic corrosion risk in a wet system. On a stainless pipe run it is a straight match. Keep the fitting material and the pipe material the same, or isolate the transition deliberately.