In theory this is an oil filter wrench. For that purpose I think it would be marginal - the rubber grip material would likely slip over your average slippery oil filter - and that would explain its low ratings for others. It's fairly cheaply made - by no means an accurate instrument - so I'm only giving it 4 stars, which I think is one of the reasons others have rated it lower. Few mechanics will be proud to put it in their toolbox. But in its widest open position, it fits perfectly into any RV's female sewage drain and provides better leverage for removing the cap, connecting the hose and removing the hose after a drain. . The rubber grip material grips the plastic plugs perfectly without damaging the plastic. I think it's marketed for that purpose and will soon fill that niche market - it's way better than any other key on the market and it's already well priced.
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