Viega 84350 MegaPress 45° elbow Smart Connect technology Carbon steel, 1-1/4'' x 1-1/4''

The 84350 is a 1-1/4 inch by 1-1/4 inch carbon steel press fitting with press ends on both sides (P1 x P2). It is made for black iron / carbon steel pipe in that nominal size, joined with a MegaPress press tool rather than threads or welding. Both outlets are the same size, so it is a straight 45-degree change of direction, not a reducer.

No threading, no cutting oil, no flame. The 84350 has press ends on both sides, so you cut the pipe square, deburr, mark depth, slide the fitting on and press with a MegaPress jaw sized for 1-1/4 inch. That is the main reason crews pick press over threaded malleable fittings on occupied buildings where hot work permits are a problem.

Carbon steel press fittings like the 84350 are for black iron pipe systems, so the usual applications are hydronic heating, chilled water, compressed air, fire protection and gas-type service rather than potable water. For potable copper you want a copper press fitting (Viega ProPress) and for PEX a ProPress or PureFlow fitting instead. The material here is carbon steel, which is not a potable-water material.

Rough it in against these numbers: the fitting measures 5.543 inches in length, 3.85 inches in width and 2.205 inches in height, and weighs 1.069 lbs. In a packed chase or above a ceiling grid, check the 5.543 inch dimension against your offset before committing to a 45 instead of two tighter turns.

A pair of 45s makes a swing offset that gets around an obstruction with far less pressure drop than two 90-degree turns, which is why they are standard on compressed air and hydronic mains. The 84350 is the 1-1/4 inch press version of that turn. If you need a hard change of direction at a wall or riser, use a 90-degree MegaPress elbow in the same size instead.

Smart Connect is the feature designed into the sealing element so an unpressed connection leaks visibly during pressure testing instead of passing inspection and failing later. It does not change the install steps, but it does mean you should pressure test the system before closing walls so any missed press shows itself.