Viega 91785 MegaPress 45° street elbow Smart Connect technology 316 stainless steel, 1/2'' x 1/2''

FTG x P is the connection combination on the 91785: one end is a fitting (street) end sized to slip into another press fitting's socket, and the other end is a press socket that accepts 1/2 inch pipe. That is what makes it a street elbow, it lets you change direction right at another fitting without adding a short nipple between them.

It is 316 stainless steel, not carbon steel. That matters on two counts: 316 handles corrosive and wash down environments and is the grade you want where a carbon steel MegaPress fitting would rust, and it is the body material you specify for stainless pipe systems rather than black iron.

The 91785 is a 1/2 inch x 1/2 inch press fitting with no threads, one street end and one press socket. It presses onto the outside diameter of 1/2 inch pipe with a press tool and jaw, so there is nothing to thread onto. If you need to transition to threads, you want a MegaPress press by threaded adapter instead of this elbow.

Plan on roughly 3.319 inches overall length, 2.28 inches wide and 1.264 inches high for the 91785. Add clearance beyond that for the press jaw to swing around the socket, which is usually the limiting factor in a tight chase rather than the fitting itself.

Smart Connect is the feature built into the 91785 socket that lets an unpressed connection leak visibly during pressure testing, so you find the joint you missed on test rather than after the wall is closed. On a large repipe with dozens of 1/2 inch joints that is the difference between a pressure test that locates the problem and one that only tells you a problem exists.

Use the street version, like the 91785, when the turn starts at another fitting: its FTG end plugs straight into that fitting's socket, so you lose one press joint and a couple of inches of pipe. Use a socket by socket 45 when the turn happens in the middle of a pipe run. Fewer joints means fewer presses to verify on test.