Viega 25440 MegaPress tee Smart Connect technology Carbon steel, 1-1/2'' x 1-1/2'' x 3/4''

The 25440 is a 1-1/2 inch x 1-1/2 inch x 3/4 inch tee with a P1 x P2 x FPT configuration. Both 1-1/2 inch run ends are press connections for black iron pipe, and the 3/4 inch branch is female pipe thread, so you press the run and thread the branch. That makes it the fitting to use when you need to pick up a threaded drop, gauge, drain or device off a 1-1/2 inch main without cutting threads on the main itself.

Overall the tee measures 6.87 inches long, 3.189 inches wide and 2.437 inches high, and it weighs 1.741 lbs. Plan the 6.87 inch run dimension plus clearance around the body for the press tool jaw to seat square on each socket. In tight joist bays or close to a wall, that jaw swing is usually the limiting factor rather than the fitting itself.

Smart Connect is the feature Viega builds into the MegaPress sealing element so an unpressed connection leaks a small amount during pressure test instead of holding. On a job with dozens of joints, that is how you find the one your crew missed before the wall closes. It does not replace pressing every socket, it just makes a missed press visible at test.

Two of the three ends press, one threads. The 1-1/2 inch run ends take pressed black pipe, so no threading, cutting oil or dies on the main, which is the reason crews use MegaPress on retrofits in occupied buildings. The 3/4 inch branch is FPT, so you will need a male-threaded nipple or adapter with pipe sealant or tape for that leg.

Carbon steel fittings like the 25440 are intended to match black iron pipe systems, which are typically closed-loop: hydronic heating, chilled water, compressed air, fire protection, fuel gas where approved. They are not a potable water fitting. For open or potable systems you want a stainless or copper press fitting instead of carbon steel.