Viega 25671 MegaPressG union Smart Connect technology Carbon steel, 1-1/2'' x 1-1/2''

The 25671 MegaPressG union is a press by female pipe thread fitting, 1-1/2 inch on both ends. The press end goes onto 1-1/2 inch carbon steel pipe with a MegaPress jaw, and the FPT side threads onto male 1-1/2 inch NPT. That makes it the transition point where a pressed run meets threaded pipe, valve, or equipment connection.

MegaPressG is Viega's gas-rated line, distinct from standard MegaPress used on water and hydronic. The 25671 is the 1-1/2 inch carbon steel union in that family, with a press end and an FPT end, and it carries the Smart Connect feature that leaves an unpressed connection detectable during pressure testing.

The fitting body itself measures 4.346 inches long, 2.992 inches wide and 2.756 inches high. Plan beyond that for the press tool jaw, which needs room to open and rotate around the press end. If the wall or joist bay only just clears the fitting dimensions, you will not get the jaw on it.

Smart Connect is a feature built into the sealing element so an unpressed joint leaks during the pressure test rather than passing inspection and failing later. On a 1-1/2 inch carbon steel fitting like the 25671, that matters on a long run where one missed crimp is easy to lose track of. It does not replace pressing every joint, it just makes the miss obvious.

Carbon steel. That pairs it with black iron and carbon steel pipe systems, not with copper or stainless runs. If your line is stainless, you need the stainless version of the fitting instead, because mixing the two invites galvanic problems at the joint.

A threaded union needs both sides cut, threaded and dope-sealed, and it needs rotational access. The 25671 gives you a pressed end on the pipe side and a threaded female end on the other, so you only have to thread one connection. It's the common pick for tying into existing threaded pipe, a valve, or a piece of equipment that has to come apart later for service.

Viega 25671 is the number to specify. It's the 1-1/2 inch by 1-1/2 inch carbon steel MegaPressG union with a press end and a female threaded end. There is one configuration under that number, so there is no finish or option code to add.

Germany. That country of origin is on record for the fitting and is the detail procurement teams usually need for submittal packages and domestic-content questions on a project.

It weighs 2.226 lbs. For overhead carbon steel runs, that point load sits on top of the filled pipe weight, so keep a hanger near any union or grouping of fittings rather than letting it hang mid-span.