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In regards to mega press fittings on a vertical application, some inspectors failed the job because they said you needed to seal the fittings with silicone to prevent water from sitting in the fitting hub and then freezing would cause the fitting to fail.
Thanks to inspector Claude Bission for seeking clarification on this issue.
Claude contacted the board along with Peter Defreitas and viega.
The response from viega: Regarding the question. We do not require the fitting to be sealed from the outside when it is installed in a vertical position. If someone would like to they can use 100% silicone after the press has been made. ( Do Not get the silicone inside the fitting ) Please take a look at the attached letter that talks about this. Freezing is Not a concern as it would be similar to an ice cube tray where any water that froze would be able to expand up over the top of hub not putting any force on the joint itself.
Hope this helps, Also mega press is approved for outside and underground use.