Viega 95150 MegaPress tee Smart Connect technology 304 stainless steel, 1-1/2'' x 1-1/2'' x 3/4''

The 95150 MegaPress tee is a reducing tee: 1-1/2 inch on the run (both ends) with a 3/4 inch branch. All three ends are press connections (P1 x P2 x P3), so there is no threading or welding at any outlet.

Neither. All three outlets on the 95150 are press ends, so it installs cold with a press tool and the correct 1-1/2 inch and 3/4 inch jaws. No pipe threading, no hot work permit, no welding. You will need jaws for both sizes to finish the fitting, which is the detail most often missed when ordering a reducing tee.

MegaPress fittings press onto carbon steel pipe, and the 95150 body is 304 stainless steel. Stainless MegaPress bodies are the ones specified where the fitting itself needs corrosion resistance. For a gas application you must confirm the fitting carries the gas-rated sealing element, because the press body alone does not determine that, so order the MegaPressG version if the line is fuel gas.

Smart Connect is a deliberate feature in the sealing element that leaks a trace when a joint has not been pressed. On a tee like the 95150 that matters more than on a coupling, because there are three joints to press and one missed press on the 3/4 inch branch is easy to walk past. You pressure test, see the weep, and go back and press it before the wall closes.

The difference is the fitting body. A 304 stainless body is chosen where the medium or the environment would attack a carbon steel fitting, typical of mechanical rooms, some process and chilled water work. If the system is ordinary black steel heating pipe in a dry space, the carbon steel MegaPress tee in the same 1-1/2 x 1-1/2 x 3/4 configuration does the same job.

The 3/4 inch is the branch outlet and the two 1-1/2 inch ends form the straight run, so the reduction is on the takeoff, not in the main line. If you need the reduction in the run itself rather than at the branch, a reducing coupling or a differently configured tee is the part to order instead.