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78157 Viega ProPress reducer Smart Connect technology Copper, 1-1/4'' x 1''
Manufacturer Resources
Product Specs
- Connection Type:
- P1 x P2
- Material Type:
- Copper
- Product Dimension:
- 1-1/4'' x 1''
- Department:
- Plumbing
- Product Group:
- Plumbing Fittings
- Product Subgroup:
- Reducers
- Product Type:
- Reducer
- Product Length:
- 1.76"
- Product Height:
- 1.76"
- Product Weight:
- 0.25 lbs
- Product Width:
- 2.484"
- Product Material:
- Copper
Viega 78157 – Frequently Asked Questions
1) Does the Viega 78157 ProPress reducer press onto copper tube on both ends, or is one end threaded?
Both ends are press ends. The 78157 is a copper ProPress reducer with a P1 x P2 connection, meaning a 1-1/4 inch press socket reducing to a 1 inch press socket. There is no thread on either side, so you press it onto copper tube at both ends with a ProPress tool and the matching jaw sizes.
2) Can I use a copper ProPress reducer like the 78157 on PEX or steel pipe?
No. The 78157 is a copper press fitting sized for 1-1/4 inch and 1 inch copper tube. Carbon steel systems need Viega's MegaPress line and PEX needs PureFlow press or crimp fittings, since the sealing element and socket geometry differ by system. Mixing systems on the same press socket is not a valid connection.
3) Do I need two different press jaws to install the 78157 reducer?
Yes. Because the sockets are different sizes, you press the large end with a 1-1/4 inch jaw and the small end with a 1 inch jaw. Crews carrying only one jaw size will get one joint pressed and leave the other loose, which is exactly the condition the Smart Connect feature exposes on pressure test.
4) Which direction does the 1-1/4 x 1 ProPress reducer run, and can I use it to step up as well as down?
It is a straight reducing coupling with a 1-1/4 inch socket on one end and a 1 inch socket on the other, so it works in either direction on a copper line. Running toward a fixture branch it steps 1-1/4 inch down to 1 inch; coming off a 1 inch stub into a larger main it steps up. Flow direction does not matter to the fitting.
5) What is Smart Connect on this Viega ProPress reducer and why does it matter on a job?
Smart Connect is Viega's feature that lets an unpressed connection leak a small amount during pressure testing, so an inspector or plumber can spot a joint that was missed before the walls close up. The 78157 reducer includes it. It does not replace pressing, it just makes a skipped press visible on test.
6) How much room do I need for the Viega 78157 reducer in a tight wall cavity?
The fitting measures 1.76 inches in length and height with a 2.484 inch width across the press beads, and it weighs 0.25 lbs. Plan clearance around that footprint plus the swing of the press jaw, which needs more room than the fitting itself when you rotate the tool onto the bead.
7) What part number and manufacturer should I put on a submittal for a Viega 1-1/4 x 1 copper press reducer?
Specify Viega ProPress model 78157, copper reducer, 1-1/4 inch x 1 inch press x press. It is made in Germany. That model number is the single orderable item, so no suffix or option code is needed on the purchase order.
8) Is a sealing element included with the Viega 78157, or do I buy it separately?
The ProPress reducer comes with its sealing element already installed in each socket. Nothing else is required to make the joint beyond cut, deburr, mark insertion depth, and press. Check that both elements are seated and undamaged before insertion, since a nicked element is the usual cause of a weeping press joint.
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reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Viega 78157 come with a warranty?
Absolutely. The Viega 78157 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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