Viega 84410 MegaPress tee Smart Connect technology Carbon steel, 3/4'' x 3/4'' x 1/2''

The MegaPress tee, part number 84410, is a 3/4 inch x 3/4 inch x 1/2 inch reducing tee. The run is 3/4 inch on both ends and the branch outlet steps down to 1/2 inch, so it is what you use to pick up a 1/2 inch branch off a 3/4 inch line without adding a separate bushing.

It is a press fitting on all three ends. The connection is listed as P1 x P2 x P3, meaning three press outlets, so it goes on with a MegaPress jaw and a press tool rather than being threaded, soldered or welded. No pipe threading and no hot work on the job.

The 84410 is a carbon steel fitting, which is what MegaPress is built for: black iron and carbon steel pipe systems such as hydronic heating, compressed air and fire protection runs. Carbon steel is not the right body material for potable copper or stainless work, where a copper press or stainless press tee is the correct choice instead.

Dimensions are 4.528 inches long, 2.886 inches wide and 1.496 inches high. Add clearance beyond that for the press jaw to wrap the fitting and rotate, which is usually what decides whether a press tee works in a tight chase, not the fitting body itself.

Smart Connect is a feature of the sealing element that lets an unpressed connection leak intentionally when the system is tested, so an installer finds a missed joint during pressure test instead of after the walls close. On a multi-branch tee like the 84410 with three press ends, that is three joints per fitting to keep track of, which is exactly where it pays off.

On the branch. 84410 is sized 3/4 x 3/4 x 1/2, so the straight run stays 3/4 inch end to end and only the outlet is 1/2 inch. If you need the reduction in the run instead, you want a different MegaPress tee designation, not this one.

Made in Germany, and each tee weighs 0.65 lbs. The weight is useful when you are sizing hanger spacing and support loads on a horizontal carbon steel run with several branch fittings in it.