Viega 78187 ProPress coupling No stop Smart Connect technology Copper, 1-1/4'' x 1-1/4''

A no-stop coupling has no internal shoulder, so the tube can slide all the way through the fitting. That's what you want on a repair or a tie-in where you can't pull the pipe apart to get the needed insertion depth: slide the coupling along the existing line, position it over the joint, then press both ends. A coupling with a stop centers itself automatically and is the easier choice on new work where both tube ends can be butted into the fitting. With the 78187, you have to mark your insertion depth yourself before pressing, since nothing in the fitting sets it for you.

No. The 78187 is a copper fitting built for copper tube press connections on both ends. Press systems for PEX and for carbon steel use different fittings and different jaws, so don't substitute this one onto those materials.

Smart Connect is a feature of the sealing element that lets an unpressed connection leak intentionally during pressure testing. On a 1-1/4 inch line with several of these couplings, that means a joint you skipped shows itself at test rather than after the wall is closed. It does not replace pressing, every joint still has to be pressed with the correct jaw.

Pressed. Both ends are press connections, so the joint is made cold with a press tool and the correct 1-1/4 inch jaw, no torch, no flux, no solder. That is the practical reason crews use it in occupied buildings and anywhere a hot work permit is a problem.

The fitting itself measures 2.122 x 2.992 x 2.122 inches, but the clearance that actually governs is the swing of the press jaw, which is larger than the fitting. In tight joist bays or against a wall, plan for jaw access on the full circumference of the tube at both press locations, and remember a no-stop coupling needs the slack to slide into position first.

Yes, if those fittings are Viega ProPress copper. The 78187 is a copper ProPress coupling with press ends on both sides, so it presses with the same tool and jaw set a maintenance crew already uses for 1-1/4 inch ProPress copper. It is made in Germany, same as the rest of the ProPress copper line.

The sealing element is already in the fitting, so the coupling itself is complete as supplied. What you provide is the press tool with a 1-1/4 inch jaw, a clean square-cut and deburred tube end, and a depth mark on each side since this is a no-stop body. One coupling weighs 0.216 lbs, which is worth knowing if you're ordering a case for a riser job.