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78172 Viega ProPress coupling No stop Smart Connect technology Copper, 1/2'' x 1/2''
Manufacturer Resources
Product Specs
- Connection Type:
- P1 x P2
- Country Of Origin:
- United States
- Material Type:
- Copper
- Product Dimension:
- 1/2'' x 1/2''
- Department:
- Plumbing
- Product Group:
- Plumbing Fittings
- Product Subgroup:
- Couplings
- Product Type:
- Coupling
- Product Length:
- 0.957"
- Product Height:
- 0.957"
- Product Weight:
- 0.08 lbs
- Product Width:
- 1.614"
- Product Material:
- Copper
Viega 78172 – Frequently Asked Questions
1) What is a no-stop ProPress coupling used for versus a standard coupling with a tube stop?
The Viega 78172 is a 1/2 inch by 1/2 inch ProPress copper coupling with no internal tube stop, so copper tube can slide all the way through it. That is what you want for repair work: cut out a bad 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 partway in. On new runs where you can bring both tube ends to the fitting, a stop coupling is the easier choice since it self-locates.
2) What size and type of pipe does the Viega 78172 ProPress coupling join?
It joins 1/2 inch copper tube to 1/2 inch copper tube, press on both ends (P1 x P2). The body is copper, so it's for copper systems, not PEX and not steel.
3) Do I need a press tool for the Viega 78172, or can it be soldered?
This is a press fitting. Both ends are press connections (P1 x P2) and require a press tool with the correct 1/2 inch ProPress jaw. Nothing about it is a solder cup, and the sealing element is not meant to see a torch. No fire watch, no flux, no solder, but you do need the tool on the truck.
4) Can I use the 78172 to splice in a repair without cutting the pipe loose from its hangers?
That's exactly the case it's built for. With no internal stop, the coupling slides fully onto existing tube, so you can drop in a replacement length between two fixed ends and then slide the coupling back over the seam and press it. You do need clean, deburred, properly marked tube on both sides and insertion depth marked by hand, since the fitting won't set the depth for you.
5) What does Smart Connect technology do on a Viega ProPress fitting?
Smart Connect is the feature that makes an unpressed joint show itself. During pressure testing, a connection that was missed leaks visibly at the fitting instead of passing inspection and failing later in a wall. On a repair coupling like the 78172 that matters twice over, since a slip coupling has two separate presses to remember.
6) How much room does a 1/2 inch Viega slip coupling need between studs or in a tight joist bay?
The fitting itself is listed at 1.614 inches by 0.957 inches by 0.957 inches and weighs 0.08 lbs. The bigger clearance question is the press jaw, not the fitting, and because it's a no-stop coupling you also need enough slack to slide it fully clear of the joint on one side before you center it. In very tight cavities that slide room is usually what decides it.
7) Is the Viega 78172 coupling made in the USA?
Yes, it's listed as Made in USA, which is what matters on public and institutional jobs carrying domestic sourcing requirements. The part number to specify is Viega 78172.
How fast can I get the Viega 78172 delivered?
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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 78172 come with a warranty?
Absolutely. The Viega 78172 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Viega 78172?
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