You may also like
28780 Viega MegaPressG coupling With stop Smart Connect technology Carbon steel, 4" x 4"
Manufacturer Resources
Product Specs
- Connection Type:
- P1 x P2
- Material Type:
- Carbon Steel
- Product Dimension:
- 4" x 4"
- Department:
- Plumbing
- Product Group:
- Plumbing Fittings
- Product Subgroup:
- Couplings
- Product Type:
- Tee
- Product Length:
- 7.874"
- Product Height:
- 5.193"
- Product Weight:
- 3.965 lbs
- Product Width:
- 5.193"
- Product Material:
- Carbon steel
Viega 28780 – Frequently Asked Questions
1) What size pipe does the Viega MegaPressG 28780 coupling join?
The MegaPressG 28780 is a 4 inch by 4 inch coupling with stop, so it joins two runs of 4 inch carbon steel pipe end to end. Both ends are press connections (listed as P1 x P2), meaning each side is pressed onto the pipe rather than threaded or welded.
2) Does the Viega 28780 have a stop inside, or can I slide it along the pipe?
It is a coupling with stop, so there is an internal shoulder that sets insertion depth on each side. That makes it the standard choice for joining two fixed pipe ends, but it will not slide over an existing run. For a repair where you need to slip the fitting along the pipe, you need a coupling without stop instead.
3) Is the Viega MegaPressG 28780 for gas or for water lines?
MegaPressG is Viega's gas-rated press system for carbon steel pipe, distinguished from standard MegaPress by its yellow HNBR sealing element. The 28780 is the 4 inch carbon steel version. Use standard MegaPress fittings for hydronic and other non-fuel-gas carbon steel applications.
4) Can I press the Viega 28780 onto stainless or copper pipe?
No. The 28780 is a carbon steel MegaPressG fitting, sized and sealed for black iron and other carbon steel pipe. Copper runs take a ProPress copper fitting and stainless takes a stainless press fitting; mixing the material families is not a valid connection.
5) What does Smart Connect technology do on this Viega coupling?
Smart Connect is Viega's unpressed-connection feature: an unpressed fitting leaks visibly during pressure testing so the installer finds it before the system is closed up. The 28780 coupling includes it.
6) How much does the 4 inch MegaPressG coupling weigh and how much room does it need?
The 4 inch coupling weighs 3.965 lbs and measures 7.874 inches in length with a 5.193 inch height and width. Factor the 5.193 inch envelope into tight chases or close pipe spacing, since the press jaw needs clearance around that body to close.
7) Is the Viega 28780 a tee or a coupling?
It is a straight coupling, joining two 4 inch pipe ends in line. There is no branch outlet. If you need a branch off a 4 inch carbon steel run, you want a MegaPress tee, not this part.
8) Where is the Viega MegaPressG coupling manufactured?
Made in Germany. Useful when a submittal or a government or institutional spec asks for country of origin on the fitting schedule.
How fast can I get the Viega 28780 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
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 28780 come with a warranty?
Absolutely. The Viega 28780 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 28780?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Viega 28780 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.