Viega 90430 MegaPress union Smart Connect technology 316 stainless steel, 1-1/2'' x 1-1/2''

The Viega 90430 MegaPress union joins 1-1/2 inch to 1-1/2 inch, press on both ends (P1 x P2). It is a straight same-size coupling style union, not a reducer, so both pipe ends must be 1-1/2 inch.

It is 316 stainless steel. That matters when you are choosing between MegaPress carbon steel fittings and the stainless version: 316 is the grade you want where the line or the environment is corrosive, such as wash-down areas, coastal installs, or chemical and process piping. If your system is black iron or carbon steel schedule pipe in a dry mechanical room, the carbon steel MegaPress line is the usual match.

Not the way a threaded or flanged union comes apart. A pressed joint is permanent, so the 90430 is used to join two fixed pipe ends in place, which is what makes it useful where you cannot rotate pipe to thread it together. If you need a connection you can break for pump or valve service, specify a threaded or flanged union instead and transition to it.

Smart Connect is the feature built into the sealing element that intentionally leaks a small amount during pressure testing if the connection was not pressed. On a 1-1/2 inch stainless MegaPress union buried in a rack of pipe, that is how you find the one joint the crew missed before the system goes into service.

Plan for roughly 6.709 inches of length, 2.992 inches of width and 2.756 inches of height for the fitting body. The bigger constraint is usually the press tool jaw, not the fitting, so leave clearance around the fitting for the jaw to close fully. The fitting weighs 2.468 lbs.