Viega 91950 MegaPress union Smart Connect technology 316 stainless steel, 2'' x 2''

The MegaPress 91950 is a 2 inch by 2 inch press union, so both ends press onto 2 inch pipe. Connection type is press x press (P1 x P2), meaning no threading, soldering or welding on either side.

It is 316 stainless steel throughout, which is the grade Viega uses for its stainless MegaPress line. That matters if your system carries anything corrosive or the fitting sits in a damp or washdown area, where a carbon steel body would be the wrong call.

No. This is a steel-pipe press fitting with 316 stainless press ends sized for 2 inch pipe. For copper tube you need a copper press system, and for PEX a PEX press fitting and ring. Mixing systems is not a field judgement call, the sealing geometry is different.

A union is there so you can break the line later for service without cutting it. On the 91950 both halves are press connections rather than pipe threads, so you cut, deburr, mark depth, and press. No thread cutting oil, no pipe dope, and no open flame, which is what gets these used in occupied buildings and mechanical rooms where hot work permits are a problem.

Smart Connect is the feature in the MegaPress sealing element that leaves an unpressed connection deliberately leaking during pressure test, so an installer can spot a joint that was missed before the system is closed up. It is built into the 91950 union, not an add-on.