Reddit reviews Camco RhinoFLEX 6-in-1 Sewer Cleanout Plug Wrench with Easy Grip Handle- Easily Loosen Any RV Dump Station Cap with Universal Design, 3" or 4" Male and Female Sewer Cleanout Plugs (39755)
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Loosen any dump station cap with easeWorks with 3" and 4" male or female plugsWorks with slotted or flush sewer plugsUniversal 6-in-1 toolEasy grip handle
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https://www.amazon.com/Camco-39755-RhinoFLEX-Cleanout-Wrench/dp/B00BDEP9S0