Viega 20753 ProPress coupling No stop Smart Connect technology Copper, 4'' x 4''

Yes. The Viega 20753 ProPress coupling is 4 inch by 4 inch with a press end on each side, listed as a P1 x P2 connection. Both ends get crimped onto 4 inch copper tube with a press tool and the matching 4 inch jaw or ring set, so there is no soldering on either joint.

A no-stop coupling has no internal tube stop, so it slides freely along the pipe. That is what you use for a repair in an installed line: cut out the damaged section, slip the coupling fully onto one side, bring the new piece in, then slide the coupling back to center and press both ends. A coupling with a stop can't do that because the tube bottoms out mid-fitting. For new runs where you can butt both tubes to a stop, the stop version is the easier one to mark and depth-check.

That is exactly what the sliding no-stop body is for, with one condition: both tube ends must be cut square, deburred and clean, and you need enough straight tube on each side for full insertion depth plus room to slide the coupling clear. Mark your insertion depth on both pipes before you center it, because without an internal stop nothing holds the engagement for you.

Smart Connect is a feature of the sealing element that lets an unpressed connection leak visibly during pressure testing instead of holding tight and failing later. On large diameter work like 4 inch, where a single missed crimp on a riser can be expensive to find, that is the safeguard that shows up during the test rather than after the ceiling closes.

Germany. That matters on public and institutional jobs where country of origin has to be documented in the submittal package, so the 20753 can be reported as German manufacture.