Viega 90100 MegaPress 45° street elbow Smart Connect technology 316 stainless steel, 2'' x 2''

P x FTG means one end is a press socket that takes 2 inch pipe, and the other end is a fitting-end (street) that is sized to slip into another 2 inch press socket. That is what makes it a street elbow: you can press it directly into the next fitting without adding a short nipple between them.

The 90100 is a 2 inch by 2 inch MegaPress fitting, and MegaPress is the press system made for black iron and galvanized carbon steel pipe. This one is built in 316 stainless steel, which is the material you want where the run or the environment is corrosive. Pipe must be 2 inch nominal on the press end.

Use the street version, like the Viega 90100, when you need the elbow to plug straight into another fitting's press socket. Its P x FTG ends give you one press socket and one fitting end. A standard 45 has two press sockets, so joining it to another fitting means cutting and adding a length of pipe between them. For offsetting around an obstruction in tight quarters, the street elbow saves you a joint.

Smart Connect is Viega's unpressed-connection feature: a joint that was left unpressed will leak during pressure test so you find it before the walls close. On a multi-story or large MRO run with dozens of 2 inch joints, that is the difference between a quick test and crawling the whole line looking for the one you missed.

316 stainless is the corrosion-resistant choice. Use it where the fitting sees wash-down, coastal or chemical exposure, or where the specification calls out stainless for the service. The 90100 is 316 stainless throughout, and it is made in Germany.