Viega 90660 MegaPress coupling No stop Smart Connect technology 316 stainless steel, 2-1/2'' x 2-1/2''

The Viega 90660 MegaPress coupling is a 2-1/2 inch by 2-1/2 inch fitting, so it joins two runs of 2-1/2 inch pipe in line. Both ends are press connections (P1 x P2), not threaded or grooved, so you press it with a tool and jaw set sized for 2-1/2 inch MegaPress.

No stop means the coupling has no internal tube stop, so it slides freely along the pipe. That is what you want for a repair or a tie-in where both pipe ends are already fixed in place and you cannot spring them apart: slide the coupling fully onto one side, bring the second pipe in, then slide it back to center and press both ends. A stop-type coupling butts each pipe against an internal ridge and is the better choice on new work where you want a positive insertion depth. With the no-stop version you have to mark your insertion depth on the pipe yourself.

It is built from 316 stainless steel, the more corrosion resistant of the common stainless grades and the one specified where chlorides, washdown, marine air, or chemical service are in play. Carbon steel MegaPress fittings are the cheaper option for dry black iron gas and hydronic work, but they are not what you put on a corrosive or exposed line. Match the fitting to the pipe: 316 stainless fittings belong on stainless pipe.

Smart Connect is Viega's unpressed-connection feature. An unpressed fitting deliberately leaks during pressure or leak testing so the installer finds it before the wall closes up. On a big job with dozens of 2-1/2 inch joints, it is how you catch the one connection a helper walked past. It does not replace pressing every joint; it only makes a missed one show itself.

No. MegaPress press fittings ship with the sealing element already installed in each press end, so the 90660 is ready to go out of the box. What you do need to supply is a press tool with the correct 2-1/2 inch MegaPress ring and actuator, plus a deburring tool and a depth marker, since this is the no-stop version and you set insertion depth by mark.

Made in Germany. For federal, state, or institutional jobs carrying domestic sourcing language, check that against your spec before you submit it, because country of origin is often the line that gets a submittal kicked back on stainless press fittings.

Viega part number 90660. Spec it as a MegaPress 316 stainless steel coupling, no stop, 2-1/2 inch by 2-1/2 inch, press by press, with Smart Connect. That is the full identity a wholesaler or a reviewing engineer needs.