Thetford 40540 Term Adapter for SmartTote Portable Waste Tank
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Questions & Answers
The adapter I use to drain a rolling tank at a dump station does not have a female to female connection, so I'm not sure if they make a female to female part.
The standard RV sewer hose is 3" in diameter, so yes, it will work. The one I have was about the same as the one I measured. The product can be purchased from Amazon, Camping World, and RV dealers.
Couplers connect the hooks on the claw hook together depending on which claw hook is used. 40540 is the Amazon part number. There is a claw hook on both ends of the hose and waste tank and they will not connect. I wish you success.
The cost is high! Even so, it is likely that what you need will be found elsewhere when you can't find it elsewhere. The system works flawlessly. It does not leak.