Viega 25665 MegaPress union Smart Connect technology Carbon steel, 1-1/4'' x 1-1/4''

The 25665 is a P x FPT fitting: one press end for 1-1/4 inch carbon steel pipe and one 1-1/4 inch female pipe thread. So it presses onto the pipe on one side and takes a male-threaded nipple, valve tailpiece, or adapter on the other.

No. The 25665 is carbon steel and is made for black iron and carbon steel pipe systems. Copper calls for a ProPress copper fitting and stainless calls for a stainless press fitting; pressing a carbon steel body onto copper tube is the wrong match on both material and the sealing element.

MegaPress fittings use Viega's Smart Connect feature, which leaks visibly at low pressure during testing if a joint has not been pressed. That turns a missed press into something you find on test rather than after the wall is closed, which is the main reason crews on large black iron retrofits like it.

Pressing is a cold, flameless join. On a 1-1/4 inch carbon steel line you skip cutting threads, skip pipe dope, and skip the hot work permit and fire watch that welding or brazing triggers in occupied buildings. The tradeoff is tooling: you need the press tool with the correct 1-1/4 inch MegaPress jaw or ring, where threading only needs a die head. The FPT branch on the 25665 lets you tie into existing threaded components without reverting to threading the pipe itself.

MegaPress fittings ship with the sealing element already in the press socket. What you supply is the tool and the correct 1-1/4 inch jaw or ring, plus a properly cut and deburred pipe end marked to full insertion depth before you press.

Made in Germany, and each 25665 weighs 2.065 lbs. Useful numbers if you are putting together a submittal package or pricing freight on a large fitting count for an institutional job.