They are 1-1/16" except for the ones that are 15/16" such as the one on every RV we have owned. I found a CAMCO plug with a petcock taht makes it even easier.
You do have to use some anti sieze or Teflon pipe tape on the threads of that gadget as it may freeze in place from dissimilar metals electrolytic problem.
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Dave W
2014 Montana High Country 343RL (Sold!)
2011 Ford 6.7 Lariat CCLB (Went to PU Heaven)
2019 F150SC XLT SE Sport,w/full tow package
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