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90420 Viega MegaPress union Smart Connect technology 316 stainless steel, 3/4'' x 3/4''
Manufacturer Resources
Product Specs
- Connection Type:
- P1 x P2
- Material Type:
- 316 Stainless Steel
- Product Dimension:
- 3/4'' x 3/4''
- Department:
- Plumbing
- Product Group:
- Plumbing Fittings
- Product Subgroup:
- Unions
- Product Type:
- Union
- Product Length:
- 4.984"
- Product Height:
- 1.811"
- Product Weight:
- 1.036 lbs
- Product Width:
- 2.028"
- Product Material:
- 316 stainless steel
Viega 90420 – Frequently Asked Questions
1) What size pipe does the Viega MegaPress 90420 union fit?
The Viega 90420 MegaPress union is a 3/4 inch by 3/4 inch fitting, so it joins two runs of 3/4 inch pipe. Both ends are press connections (P1 x P2), not threaded, so each side gets crimped onto the pipe with a press tool and jaw sized for 3/4 inch MegaPress.
2) Is the Viega 90420 MegaPress fitting stainless or carbon steel?
It is 316 stainless steel, which is the corrosion resistant grade Viega uses for its stainless MegaPress line. That matters if you are running the fitting in a damp mechanical room, a coastal site, or on a system where carbon steel would rust at the joint. If your pipe run is black iron and the rest of the job is carbon steel MegaPress, this is the stainless version, not the carbon one.
3) What does Smart Connect technology on the Viega 90420 actually do for the installer?
Smart Connect is Viega's unpressed joint feature: the sealing element is shaped so an unpressed connection leaks visibly during pressure testing instead of holding. On a 20 story stack or a long commercial run, that is how you find the one joint a crew missed before the ceiling closes. It does not change the press procedure, just makes a missed press show itself on test.
4) How much space do I need to fit the Viega 90420 union between two pipe ends?
Plan for the fitting's overall length of 4.984 inches, with a 2.028 inch width and 1.811 inch height envelope around it. That is the clearance you need in a tight chase or between joists, plus room to get the press jaw around the collar on each end.
5) Can I use the Viega 90420 to connect 3/4 inch threaded pipe?
Not directly. Both sides are press ends, so a male or female threaded pipe end will not land in this fitting. To tie into existing threaded pipe you need a MegaPress adapter with a threaded end on one side, then press into the 90420 from there.
6) Will the stainless MegaPress union mix with carbon steel MegaPress fittings on the same system?
Mechanically the press geometry is the same family, but joining 316 stainless to carbon steel puts two dissimilar metals in contact, which is where galvanic corrosion starts. On a mixed system, keep the stainless section continuous or use a proper dielectric transition at the changeover rather than pressing stainless straight onto carbon steel pipe.
7) What is the Viega part number and weight for ordering the 3/4 inch stainless MegaPress union?
Order it as Viega 90420. It weighs 1.036 lbs each, which is useful if you are pricing freight on a bulk order of stainless fittings. It is made in Germany.
How fast can I get the Viega 90420 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 90420 come with a warranty?
Absolutely. The Viega 90420 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 90420?
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 90420 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.