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20705 Viega ProPress reducer Smart Connect technology Copper, 3'' x 1-1/2''
Manufacturer Resources
Product Specs
- Connection Type:
- P1 x P2
- Material Type:
- Copper
- Product Dimension:
- 3'' x 1-1/2''
- Department:
- Plumbing
- Product Group:
- Plumbing Fittings
- Product Subgroup:
- Reducers
- Product Type:
- Reducer
- Product Length:
- 3.681"
- Product Height:
- 3.681"
- Product Weight:
- 1.245 lbs
- Product Width:
- 5.173"
- Product Material:
- Copper
Viega 20705 – Frequently Asked Questions
1) What size copper does the Viega 20705 ProPress reducer connect?
The Viega 20705 is a 3 inch by 1-1/2 inch reducer, so it takes you from 3 inch copper tube down to 1-1/2 inch in one fitting. Both ends are press connections (P1 x P2), so there is no threaded or sweat end on it.
2) Can I use the Viega 20705 reducer on PEX or steel pipe?
No. It is a copper press fitting with two ProPress copper ends, intended for copper tube. For PEX or carbon steel you need the corresponding PureFlow or MegaPress line instead, not this fitting.
3) Do both ends of the 3 x 1-1/2 ProPress reducer need the same press jaw?
No, they do not. The 3 inch end and the 1-1/2 inch end are different sizes, so you press each with the ring or jaw matched to that size. The 3 inch side is typically pressed with a press ring and actuator rather than a standard jaw, while 1-1/2 inch also falls in ring territory on most tools. Plan on having both sizes of tooling on the cart before you cut the pipe.
4) What does Smart Connect mean on this Viega reducer, and does it change how I install it?
Smart Connect is a feature of the sealing element that lets a fitting which has not been pressed leak visibly during pressure testing, so an unpressed joint shows itself instead of hiding in a wall. It does not change the install: cut square, deburr, mark insertion depth, seat the tube fully, press once. Pressure test before closing up the wall so the feature can do its job.
5) How much room do I need to fit a Viega 3 x 1-1/2 inch press reducer in a tight chase?
The fitting measures 3.681 inches in height and length and 5.173 inches across, and weighs about 1.245 lbs. On top of that footprint you need clearance for the press ring and actuator to swing around the 3 inch end, which is usually the limiting factor in a tight chase rather than the fitting itself.
6) Is a press reducer or a sweat reducing coupling better for a 3 inch to 1-1/2 inch copper transition?
On a 3 inch line a press reducer like the Viega 20705 avoids open flame and the long heat soak a 3 inch sweat joint needs, which matters in an occupied building or anywhere a hot work permit is a hassle. A sweat reducing coupling is the cheaper part but needs a torch, flux, solder, and a dry line. If the system is already ProPress, stay with press so the joints are consistent and the line can be pressure tested the same way.
7) What is the Viega part number and manufacturer for this 3 x 1-1/2 copper press reducer?
It is Viega part number 20705, a ProPress copper reducer in 3 inch by 1-1/2 inch, made in Germany. That MPN is what you want on a purchase order or a submittal so the 3 inch to 1-1/2 inch press size is unambiguous.
8) Will a copper press reducer work on a potable water riser, or is it only for heating?
The 20705 is a copper ProPress reducer and copper press fittings are standard on potable water risers as well as hydronic heating and chilled water. The deciding factor is the sealing element, so match the fitting's seal to the medium in the line before you order a quantity for a mechanical room.
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Viega 20705 come with a warranty?
Absolutely. The Viega 20705 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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