I'm using Uponor brass fittings to connect to old galvanized Pipe. Some of these fittings are very hard to get to because they're near the eve of the house -- maybe even impossible. I'm wondering if it's safe to zip these fittings on with an impact wrench.

The spec sheet for these fittings are very specific, defining all elements.

Diagram of fitting

For the 3/4 Uponor fitting, F (which looks like r) is 1.06 inches so I would need a 28 mm socket. My impact wrench can put out 300 ft/lb of fastening torque. Is it ok to zip these on to galvanized pipe with a little bit of pipe dope, or should I use a monkey wrench like it's 1840?

  • 1
    I wouldn't use a powered wrench. If you're thinking about using an impact wench, though, I presume you have a socket which fits; you could drive that by hand with a rachet wrench or T-handle or whatever...
    – keshlam
    Feb 26, 2023 at 2:40
  • You can use impact wrench to unscrew, but would not use it to screw on
    – Traveler
    Feb 26, 2023 at 3:42
  • 1
    Torque sticks to limit your wrench’s enthusiasm, maybe? Feb 26, 2023 at 5:30
  • 1
    Use an impact to get it on (don't let it hammer more than once, if at all), use a ratchet to torque to final condition.
    – Huesmann
    Feb 26, 2023 at 14:34
  • 1
    With pipes it is important to use two wrenches, one to hold the pipe and the second to turn the fitting. Impact wrenches do not let you feel the final turn, so very easy to tighten too much and ruin the fitting and/or pipe.
    – crip659
    Feb 26, 2023 at 14:53


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